Such a great seminar guys, thank you so much for this, I am confident now that I can solve my problem on my car that has been troubling me for over a year now.
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you two guys have done a very good lecture for somebody like me,i now understand how to troubleshoot electrical problems on my car,thanks once again Pete thank you
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Learning theories and math involved first helps answer the questions @ 25ish min. Use a resistor inline as a bad connection simulator. A bulb is to commonly known as a load and hard to unsee. Good commentary and tips.
Thank you for exlaining this so well. i have never understood this .Iv'e allways been at the mercy of someone else to fix these type of problems. I have a few electrical issues that i feel confident to handle now. Thanks
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Another great video! I don't agree with the comments that say gee its 1 1/2 long, get to the point. I have always believed you put the time in to learn what you need to learn. I would rather watch hours of video with some things not being needed than a 5 minute video on voltage drop that missed a lot of very important points. Theres so many different scenarios possible that you can't possibly get to all of them in a short time frame. Keep it up thank you! PS i like the method i learned a while back of integrity testing a circuit. Using bulbs to simulate loads close to the amp draw of what system you are working on. Just did one with a fuel pump, worked like a charm.
vin, you are either a useful idiot or useless... even if these 2 blokes can survive testing with their current understanding, quite alright, BUT THEIR TEACHING is total garbage
Some people dont know the first thing about electrics,These guys mentioned Ohms Law. If you have the V.I.R. TRIANGLE IN FRONT OF YOU ,You can understand these guys and begin to learn the basics of electronics. YOUR THE IDIOT WHO DOESNT THINK BEFORE YOU SPEAK. Look at all the comments, loads of people are grateful for that video because they have a better understanding of Voltage Drop across a circuit now. You mus thave a P>H>D and B>S>C in Electronics EH??? . We need guys like this to help us understand and progress in our knowledge !!!!!
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Great video and not to nit pick but a couple of points. At 23:23 you are not actually measuring Voltage drop when the meter is connected to the negative side of the load bulb. What you are measuring is "residual" or "source" voltage at that point. To truly measure pressure drop your positive meter lead should be moved to the positive battery post and then touch the positive side of the load with the red probe and the negative side with the black or common lead probe. This would give you the actual pressure drop value. The problem with this example is that the load and the thief are the same resistance. This results in both the pressure drop value and remaining voltage being equal value. I think it would help if you actually used a resistor of some different value than the "load" resistance . Also you could more easily identify the true thief in the circuit. It can be confusing which light bulb is the desired resistance versus the thief. Overall a very good explanation of the overall concept.
Paul thank you for watching and your comment. Pete is measuring a VD on the ground side. VD can be measured on either side not just on the positive. Electrons flow from negative to positive in the battery and return when the load or resistance does not use it all up. When performing a voltage drop all you need is the resistance of the circuit when the load is working. Hope that helps...thanks again...G...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast FREE videos at www.tstseminars.org/training-videos
@@TSTseminars I stand corrected, and I understand that you can measure VD on either the positive or negative side of the circuit. I thought Pete had one meter lead on battery positive and the other on the negative side of the load but I was dead wrong. He was in fact measuring VD on the negative side of the load with BOTH meter leads connected to negative. Mea culpa.
I really appreciate the whole Jeep illustration. It just shows the difference between the classroom and the real-world experience. I'm getting fairly comfortable with this Theory it's my own Steady Hand that I don't trust. LOL
Good video but I would rather have one instructor doing it because I noticed that one was contradicting the other and I just thought that having two made it a little bit confusing
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Thanks, I'd like a demonstration on connecting another load(light bulb) in parallel and which is a better option, as I see you connected the second load in series
i forgot to mention...not all systems that have wires in cars can be tested with voltmeters.....wires that carry pulsed DC will give false readings with a voltmeter because it depends on frequency of pulse and Duty time of pulse in either mode....some mechanics believe that checking coils for solenoids are bad because one side shows 12 volt power but the other side shows 3 or 4 volts...they naturally assume that the coils resistance has gone too high and assume that the solenoid is defective when in reality it is because the solenoid is being pulsed with short duty times and the meter is measuring average on times.......also you did not mention that grounds do not necessarily indicate bad connections since grounds are not necessary for units to work....whats necessary is only potential difference as long as current is available...in other words a unit may still function normally even if one side measures 12 volts and the other side measures 6 volts......there is no ground but there is a potential difference of 6 volts across the unit......there is much more in electrical circuits than what you've explained....trouble shooting is very quickly becoming a lost art....everyone is turning into a parts changer only...
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In 39:13 I think that Over Limit in Millivolt scale we can't measure more than 400 mV. If we change to Volt scale we will have 6.07 V. In mV scale we can check the voltage between positive lead and first load, between loads and between negative lead and the last load.
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Sir when you put your positive test of the meter to positive terminal of the battery and the negative test proves of the meter to the connection point of the lamp series connection then you measured 6 volts whereas the single bulb of the ckt the positive test proves of the meter connects to the positive terminal of the battery ang the negative test probes of the meter connects positive side of the load and you only measured point 2 volts why the mesaured voltage is different in that two ckt sir tnx
at the end of the video, the instructor states that he first encountered the situation: when connect the negative post of the battery and the car body, he got 12V (the battery voltage), how could that happen?
COME ON GUYS-get ALL of your tech quality up there-this is so painful and very elementary school. Lots of product placement-but not drawing me in to watch it
Have question regarding voltage drop. scenario 1. Objective=To check the integrity of ground wires from the PCM. -KOEOff ( reading 5 volts on ref) - circuit is on ( supposedly loaded) hook up one lead to BAT (Neg)and the other lead to entry point at PCM connector ( connector is attached to PCM). DMM reads 6.2mV. Would such procedure establish if the circuit is good ( mainly to see if wire going into PCM is connected to ground and in good condition) Can the LoadPro also perform this test, if so what are the conditions and hook up. Someone suggested to disconnect PCM wire, use a test light. One side goes to BAT+ the other touch the ground PCM wire, if light is "bright" circuit OK. I ask that you comment on the merits or lack thereof of each method, if possible Thank you
Q and A...Objective=To check the integrity of ground wires from the PCM. -KOEOff ( reading 5 volts on ref) - circuit is on ( supposedly loaded) hook up one lead to BAT (Neg)and the other lead to entry point at PCM connector ( connector is attached to PCM). DMM reads 6.2mV. Would such procedure establish if the circuit is good. If the vehicle was running so the components ae loading the circuit...may not always happen when KOEO. Load Pro can ... I suggest that you read the directions for the Load Pro it's easy. Someone suggested to disconnect PCM wire, use a test light. One side goes to BAT+ the other touch the ground PCM wire, if light is "bright" circuit OK. I ask that you comment on the merits or lack thereof of each method, if possible. That can be done if the wire is disconnected from the PCM and component and you use a load that can pull enough current. We have a video up with loading the circuit.... czcams.com/video/ycjhrLbrGZI/video.html Hope that helps...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast FREE videos at www.tstseminars.org/training-videos
@@TSTseminars I'm sorry I didn't make clear that the test is for the ground wires that go from the PCM to chassis ground. Test leads (DMM mV) goes from Battery negative to entry point of ground cables into PCM. This is to see if there is a voltage drop in the ground wire and if the test is valid to ascertain if ground wire from PCM is "good"
I never knew about the mv test on my meter to check for VD. That is very cool tip !!!!..... Why would i use my load pro when my meter has it already installed ??? Great vids
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Nose thank you for watching and for your kind words...If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
I understand that the circuit needs to be switched on and current flowing to get readings, but if the engine was on as well, would the voltage readings change in any way?
Tom if the engine is on along with the circuit you want to test then your good. Remember the load MUST always be ON to test for a Voltage Drop. Hope that helps...thanks for watching. If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing and www.attstraining.com for hands on training and webcast. FREE Parst 1 thru 5. Tomorrow Wednesday a LIVE webcast at www.tstseminars.org
Now what if the high resistance is inside of the primary load somehow due to corrosion or whatever but its not visible how would you voltage drop that?
Albert any corrosion is unwanted resistance that can be confirmed with a voltage drop of the load or a current ramping test. Voltage drop reading will be high while current will be low. Hope that helps...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast FREE videos at www.tstseminars.org/training-videos
Well thank you...and yes are video has improved this one was done 4 years ago....If you have not already subscribed to our tstseminars CZcams channel please do so .
Simon thanks for watching and letting us know that it was helpful. If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
I wish most mechanics would learn Ohms Law....also, you guys didn't mention that DC has a limited range before wiring resistance causes voltage drop......example - a brand new positive or negative battery cable connected to battery and is in excess of 30 feet will cause a 3 volt drop at the free end from the battery.......at the battery, it will measure 12 volts but at the end of the cable it will measure 9 volts....some people might think that is a problem but it is not....this explains the reason why some tests show lower than expected values because DC cannot travel that far without wire resistance causing voltage drop...not because the wire is bad or insufficient size but simply because electrons in wires can only be pushed so far through a cable with low voltage such as 12 volts........current flow depends on wire size but voltage determines how quickly and how far that current will flow......nice video but in order to teach people true electrical and or electronics...you guys should express more of the actual electrical or electronic terminology instead of laymans terms....people don't learn anything that way......thanks.....
52:00 is a bit confusing, specifically where we are measuring volt pressure from most negative to second most negative. One response gave an answer of "good" because he mixed zero pressure from a completed circuit compared with measuring only the negative side. If i have this correct, the pressure reading for a good negative side should be 12.5 volt pressure. Is that correct? I'm going to get a battery out in a bit and tinker.
Actually, I believe y'all said there should be low pressure, but not zero. So you are talking about a completed circuit. So the ideal voltage drop for a resister is zero, but this never happens. Therefore, in reality, a pressure (not pressure drop) of zero is an indication of an open circuit. Is that correct?
Comborico when performing a Voltage Drop on the ground side place the neg lead to the most negative on the vehicle that would be the negative battery post...next step is place the red lead to the most or next negative of the circuit you are testing....make sure the circuit is on or VD is not being measured. For the positive side place the red lean on the most positive the battery positive post and the black lead on the most or next positive of the circuit you are testing. Think of the volt meter as a pressure gauge that is place in series on a line or pipe. You are measuring the 12.6 and testing if it drops to the next positive on the circuit your are testing. If the voltage at the next positive point is 12.4 you have a 200 mV voltage drop. On the ground side there should be very little left over after the pressure/voltage is consumed by the load in the circuit. If there is more than 200 mv on a non computer circuit on the ground side you have a voltage drop. I hope this helps...thanks for watching...check out are other videos...if you have not already subscribed to our tstseminars CZcams channel please do so. thanks
hi there. Is there any training seminars coming up in March of 2016? Where can we find out and what do we need to do to become a member if we have to to get access. Looking forward to hearing from you. Thanks for your time.
Hi Michael, We have a March 19thm 2016 all day training event in Fishkill, NY at the Ramada Inn. This is an all day event - and you do not have to be a member to attend. TST has generous sponsors this year - you can attend this event for only $75.00 - please email me if your interested at doreen@tstseminar.org I can send you additional information, or call the office @ 845 628-6928 or visit the tst website www. tstseminars.org. Thank you for your interest.
I have a Buick with no turn signal or wiper speed. No emergency flashes . been on it for a week . dealer work on it an nothing fixed that was a 1200 bill
Not OPEN Loop but OPEN Circuit or Component. Thanks for watching and your comment. If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org
TSTseminars OL STANDS FOR OVERLOADED AS PER RANGE OF ALL FUNCTIONS ON A METER PER FLUKE I GET WHAT YOUR SAYING JUST WANTED TO ADD MY 2 CENTS BY THE WAY VERY GOOD PRESENTATION HAPPY NEW YEAR
If you've already answered this question in the comments pls forgive. I did try to find the answer on my own before asking you here. Here is my question...you mentioned a scenario where you get absolute zero readings on the ground side of the load after testing the positive side first and the load is getting full power. You said it was an open load. I am getting this on my SUV fuel pump and I'm not sure what that means. Can you help a brother out and clarify how I might remedy this pls? Thanks in advance if you're able!
I believe you are referring to a voltage drop test...the test needs to be performed with the pump running and the volt meter set to DC mV. Usually a good ground will have 20mV or less...on DC volts it may look like o volts. Hope that helps let me know thanks for watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast FREE videos at www.tstseminars.org/training-videos
You can’t have a perfect “0” on one side of the load and a voltage drop on the other, a perfect “0” indicates no current flow, a voltage drop indicates current flow.
Hey G hope all is well. I'm watching this video for the 5th time because i had a 2009 dodge charger with a compliant of inop horn, i performed a voltage drop test on horn circuit and it had me scratching my head. With the car running 1st push of horn on steering wheel the horn just beeps, 2nd push, noting from the horn. Fault in TIPM for horn control circuit low voltage. look at wiring diag, power is sent from TIPM to splice and out to both horns. horns grounded on rad support. When i place Pos lead to Pos side of Batt and Neg lead to Pos side of the horn and press the horn switch i get Batt voltage. When i switch the leads to Neg side batt and neg side of horn circuit i got 0v. When i disconnect one horn the other horn will work all day long. My question is in this circuit is the one horn shorted so it shorts the high side driver in the TIPM or i'm not thinking of another issue here. thanks for reading.
If you went from pos batt to pos of horn and got 12 volts theres your issue. You should not have that high of a voltage drop. If you go neg batt to pos side of horn when honking you would most likely get 0 volts . If I understood the video correctly a high voltage drop using pos to pos and neg to next positive is bad.
Isn't there a ground on control side of horn relay going into tipm? If you did loaded circuit test on that ground with light bulb. It would be very dim because of the resistance where the eyelit of that ground attaches to the body is corroded creating unwanted resistance.
Marga yes it is...Remember for a VD (voltage drop) test the circuit MUST be on. The maximum VD should be no more than 100 mV. Thanks for watching...If you have not subscribed to our tstseminars CZcams channel please do so. Restrained in more training? Go to www.tstseminars.org
Automotive fuses are more for wire protection, not circuit protection. That's why they need to be placed as close as possible to the battery, not at the load. The fuse needs to interrupt the power if a short or overload occurs anywhere downstream from the battery, so the most coverage is afforded by putting it nearest the source. czcams.com/video/YaYtCVBodpw/video.html Wondering why the headlight on the side being measured is out- figured it was a simulated problem but it seemed like it was unexpected.
Wire is part of the circuit so your right as well...thank you for sharing some good information. Please subscribe to our tstseminars CZcams channel...interested in training go to www.tstseminars.org...thank you
not sure where you are in the video...please provide the minute and seconds and I will reply...thanks for watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com.
I am not a mechanic, but the people asking the dumbest questions is an eye opener. An intelligent young person could rise quick in this profession.... leave the parts changing to the brainless, leave the diagnosing to the brains...
Bill everyone needs to start somewhere....you don't know what you don't know...no one is stupid they just need to get up to speed. Educate or evaporate...thanks for watching ... .if you have not already subscribed to our tstseminars CZcams channel please do so. thanks
Jan sorry you did not find the video helpful...there are many other videos on our channel that you can view. Can you explane what was confusing? Thank you for your comments...Thanks for watching...there are a bunch of other videos on our channel...enjoy we hope they help.If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
@@TSTseminars Ok. Thank you for answering. I then understand you are trying to be serious... But using 1½ hour with really bad sound and a camera focusing everywhere but where it should, just to make a statement that could have been done in a few minutes, made me wonder if it was a really long and really bad Monty Python kind of sketch!?... Of course the statement is really valuable -that's why I came here at the first place! -and why I bothered to comment... And of course I honour people who are trying to help others! But this presentation really sucks! It is extremely tedious, and by making it 10 times too long you are just confusing it -and your self!... -Really bad pedagogics, and with a video quality that I cannot for the life of me understand why anyone would want to publish??? Sorry guys, but this really doesn't make me want to see more of you! Only thing that might make me check you channel is the fact you actually answered here! /Jan
Jan please review the other videos and let me know what you think? Thanks again for your comments...by the way the video I believe was from 2015...check out the new Voltage drop videos...have a good one
I tested my alternator and wires for voltage drop because the alternator isn't charging. My B wire has zero resistance, I'm hearing you all say that it can not be zero. Is there an issue with this reading? The local shop bench tested it and says the alternator is good. My connections are good and my belt is good. No fuse , but I do have a fuse link but with current flowing there's no drop.
If the Voltage Drop test is performed correctly the alternator has to be running...it's impossible to have a zero voltage drop since there is some resistance in every circuit. Try it again and let us know...please subscribe to our tstseminars CZcams channel
You're absolutely correct. I went back outside tested it again. At first zero then I realized I had forgotten to change the scale to millivolts. The reading was 30m. I've tried everything my neighbor who has been a mechanic for 30 years says he still believes it's my alternator. I'm leaning that way too the light goes on and off. Thanks for the response.
Dan's Load Pro is good but you still need to know how to do a VD test if you don't own a Load Pro. Thanks for your comment and watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing and www.attstraining.com for hands on training and webcast FREE Unlocking The Potential Of Your Scan Tool with EScan and Generic Part 1 - AutoLand iScan3 Part 2 - Autel Part 3 - LAUNCH Part 4 - Snap-On Part 5 - OPUS IVS ES Part 6 www.tstseminars.org/blank-1 www.tstseminars.org/blank-2 www.tstseminars.org/blank-3 www.tstseminars.org/blank-4 www.tstseminars.org/blank-5 www.tstseminars.org/blank-6 www.tstseminars.org/blank-7 www.tstseminars.org/blank-8 www.tstseminars.org/blank-9
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Let me guess, the camera person was too busy playing with their cellphone to get the relevant points in the camera viewfinder. Or even take a couple steps closer when needed. This is a great concept to teach a very important subject but it falls on its face as produced and presented.
Training starts at 6:00.
Such a great seminar guys, thank you so much for this, I am confident now that I can solve my problem on my car that has been troubling me for over a year now.
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you two guys have done a very good lecture for somebody like me,i now understand how to troubleshoot electrical problems on my car,thanks once again Pete thank you
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Learning theories and math involved first helps answer the questions @ 25ish min.
Use a resistor inline as a bad connection simulator. A bulb is to commonly known as a load and hard to unsee.
Good commentary and tips.
Thank you for exlaining this so well. i have never understood this .Iv'e allways been at the mercy of someone else to fix these type of problems. I have a few electrical issues that i feel confident to handle now. Thanks
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Another great video! I don't agree with the comments that say gee its 1 1/2 long, get to the point. I have always believed you put the time in to learn what you need to learn. I would rather watch hours of video with some things not being needed than a 5 minute video on voltage drop that missed a lot of very important points. Theres so many different scenarios possible that you can't possibly get to all of them in a short time frame. Keep it up thank you! PS i like the method i learned a while back of integrity testing a circuit. Using bulbs to simulate loads close to the amp draw of what system you are working on. Just did one with a fuel pump, worked like a charm.
Shane thank for the support...have a good one
This old school voltage drop is great I'm surprised you guys are not using a loadpro and a multimeter the easy way.
thanks for making these video's available .
Excellent class it's great to see two experience tech share there knowledge
Vin thank you... If you have not already done so please subscribe to our tstseminars CZcams channel.
vin, you are either a useful idiot or useless...
even if these 2 blokes can survive testing with their current understanding, quite alright, BUT THEIR TEACHING is total garbage
Some people dont know the first thing about electrics,These guys mentioned Ohms Law. If you have the V.I.R. TRIANGLE IN FRONT OF YOU ,You can understand these guys and begin to learn the basics of electronics. YOUR THE IDIOT WHO DOESNT THINK BEFORE YOU SPEAK. Look at all the comments, loads of people are grateful for that video because they have a better understanding of Voltage Drop across a circuit now. You mus thave a P>H>D and B>S>C in Electronics EH??? . We need guys like this to help us understand and progress in our knowledge !!!!!
Wow,that is exactly what i have learnt as electricien automobile.thank you for the tips.i have learnt what you have shown.it really refresh my memory.
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Great video and not to nit pick but a couple of points. At 23:23 you are not actually measuring Voltage drop when the meter is connected to the negative side of the load bulb. What you are measuring is "residual" or "source" voltage at that point. To truly measure pressure drop your positive meter lead should be moved to the positive battery post and then touch the positive side of the load with the red probe and the negative side with the black or common lead probe. This would give you the actual pressure drop value. The problem with this example is that the load and the thief are the same resistance. This results in both the pressure drop value and remaining voltage being equal value. I think it would help if you actually used a resistor of some different value than the "load" resistance . Also you could more easily identify the true thief in the circuit. It can be confusing which light bulb is the desired resistance versus the thief. Overall a very good explanation of the overall concept.
Paul thank you for watching and your comment. Pete is measuring a VD on the ground side. VD can be measured on either side not just on the positive. Electrons flow from negative to positive in the battery and return when the load or resistance does not use it all up. When performing a voltage drop all you need is the resistance of the circuit when the load is working. Hope that helps...thanks again...G...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast
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@@TSTseminars I stand corrected, and I understand that you can measure VD on either the positive or negative side of the circuit. I thought Pete had one meter lead on battery positive and the other on the negative side of the load but I was dead wrong. He was in fact measuring VD on the negative side of the load with BOTH meter leads connected to negative. Mea culpa.
No problem...no one's right all the time...thanks
I really appreciate the whole Jeep illustration. It just shows the difference between the classroom and the real-world experience. I'm getting fairly comfortable with this Theory it's my own Steady Hand that I don't trust. LOL
Good video but I would rather have one instructor doing it because I noticed that one was contradicting the other and I just thought that having two made it a little bit confusing
Man this is great info. Thanks for everybody’s time.
Mike Thanks for your kind comment and for watching. If you have not already done so please subscribe to our tstseminars CZcams channel.
Subscribed and liked 👍
Thank you so much...stay tuned
thanks :)
Thanks for the helpful electrical troubleshooting information.
great video learned a lot.thanks so much i appreciate it will recommend to others
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good in depth look at voltage drop,helped to reinforce what I knew, thanks
your welcome, Thanks for watching.
Jonathan thanks for watching
What about series parallel circuits with zener diodes involved in the circuitry
Thanks for sharing this awesome video
Thanks, I'd like a demonstration on connecting another load(light bulb) in parallel and which is a better option, as I see you connected the second load in series
You guys Rock.
Safe travels.
My question is does the ground for the EVAP system from the rear selenoid go completely through the system is it the same ground
GREAT INFO.
i forgot to mention...not all systems that have wires in cars can be tested with voltmeters.....wires that carry pulsed DC will give false readings with a voltmeter because it depends on frequency of pulse and Duty time of pulse in either mode....some mechanics believe that checking coils for solenoids are bad because one side shows 12 volt power but the other side shows 3 or 4 volts...they naturally assume that the coils resistance has gone too high and assume that the solenoid is defective when in reality it is because the solenoid is being pulsed with short duty times and the meter is measuring average on times.......also you did not mention that grounds do not necessarily indicate bad connections since grounds are not necessary for units to work....whats necessary is only potential difference as long as current is available...in other words a unit may still function normally even if one side measures 12 volts and the other side measures 6 volts......there is no ground but there is a potential difference of 6 volts across the unit......there is much more in electrical circuits than what you've explained....trouble shooting is very quickly becoming a lost art....everyone is turning into a parts changer only...
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In 39:13 I think that Over Limit in Millivolt scale we can't measure more than 400 mV. If we change to Volt scale we will have 6.07 V. In mV scale we can check the voltage between positive lead and first load, between loads and between negative lead and the last load.
So, why was the one Light dim? Resistance test?
Thank you for the video. I'm finally getting it and not intimidated.
Good to hear...way to go...thanks for watching and your comment...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast
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Sir when you put your positive test of the meter to positive terminal of the battery and the negative test proves of the meter to the connection point of the lamp series connection then you measured 6 volts whereas the single bulb of the ckt the positive test proves of the meter connects to the positive terminal of the battery ang the negative test probes of the meter connects positive side of the load and you only measured point 2 volts why the mesaured voltage is different in that two ckt sir tnx
at the end of the video, the instructor states that he first encountered the situation: when connect the negative post of the battery and the car body, he got 12V (the battery voltage), how could that happen?
COME ON GUYS-get ALL of your tech quality up there-this is so painful and very elementary school. Lots of product placement-but not drawing me in to watch it
Have question regarding voltage drop.
scenario 1.
Objective=To check the integrity of ground wires from the PCM.
-KOEOff ( reading 5 volts on ref) - circuit is on ( supposedly loaded)
hook up one lead to BAT (Neg)and the other lead to entry point at PCM connector ( connector is attached to PCM).
DMM reads 6.2mV.
Would such procedure establish if the circuit is good ( mainly to see if wire going into PCM is connected to ground and in good condition)
Can the LoadPro also perform this test, if so what are the conditions and hook up.
Someone suggested to disconnect PCM wire, use a test light. One side goes to BAT+ the other touch the ground PCM wire, if light is "bright" circuit OK.
I ask that you comment on the merits or lack thereof of each method, if possible
Thank you
Q and A...Objective=To check the integrity of ground wires from the PCM.
-KOEOff ( reading 5 volts on ref) - circuit is on ( supposedly loaded)
hook up one lead to BAT (Neg)and the other lead to entry point at PCM connector ( connector is attached to PCM).
DMM reads 6.2mV.
Would such procedure establish if the circuit is good. If the vehicle was running so the components ae loading the circuit...may not always happen when KOEO.
Load Pro can ... I suggest that you read the directions for the Load Pro it's easy.
Someone suggested to disconnect PCM wire, use a test light. One side goes to BAT+ the other touch the ground PCM wire, if light is "bright" circuit OK.
I ask that you comment on the merits or lack thereof of each method, if possible. That can be done if the wire is disconnected from the PCM and component and you use a load that can pull enough current. We have a video up with loading the circuit.... czcams.com/video/ycjhrLbrGZI/video.html
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@@TSTseminars I'm sorry I didn't make clear that the test is for the ground wires that go from the PCM to chassis ground.
Test leads (DMM mV) goes from Battery negative to entry point of ground cables into PCM. This is to see if there is a voltage drop in the ground wire and if the test is valid to ascertain if ground wire from PCM is "good"
Brilliant manny thanks 😊
why do you use the positive side battery with the lead
I never knew about the mv test on my meter to check for VD. That is very cool tip !!!!..... Why would i use my load pro when my meter has it already installed ??? Great vids
Thanks for the training. I loved the video.
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Excellent work 👍 thanks
Nose thank you for watching and for your kind words...If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
I understand that the circuit needs to be switched on and current flowing to get readings, but if the engine was on as well, would the voltage readings change in any way?
Tom if the engine is on along with the circuit you want to test then your good. Remember the load MUST always be ON to test for a Voltage Drop. Hope that helps...thanks for watching. If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing and www.attstraining.com for hands on training and webcast. FREE Parst 1 thru 5. Tomorrow Wednesday a LIVE webcast at www.tstseminars.org
THIS IS GREAT!
Now what if the high resistance is inside of the primary load somehow due to corrosion or whatever but its not visible how would you voltage drop that?
Albert any corrosion is unwanted resistance that can be confirmed with a voltage drop of the load or a current ramping test. Voltage drop reading will be high while current will be low. Hope that helps...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast
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Thanks for the video.
Thanks for doing such a thorough video. Just found you guys so Hopefully the video/audio quality has improved haha
Well thank you...and yes are video has improved this one was done 4 years ago....If you have not already subscribed to our tstseminars CZcams channel please do so .
Taught me alot. Thanks guys
Simon thanks for watching and letting us know that it was helpful. If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
I wish most mechanics would learn Ohms Law....also, you guys didn't mention that DC has a limited range before wiring resistance causes voltage drop......example - a brand new positive or negative battery cable connected to battery and is in excess of 30 feet will cause a 3 volt drop at the free end from the battery.......at the battery, it will measure 12 volts but at the end of the cable it will measure 9 volts....some people might think that is a problem but it is not....this explains the reason why some tests show lower than expected values because DC cannot travel that far without wire resistance causing voltage drop...not because the wire is bad or insufficient size but simply because electrons in wires can only be pushed so far through a cable with low voltage such as 12 volts........current flow depends on wire size but voltage determines how quickly and how far that current will flow......nice video but in order to teach people true electrical and or electronics...you guys should express more of the actual electrical or electronic terminology instead of laymans terms....people don't learn anything that way......thanks.....
52:00 is a bit confusing, specifically where we are measuring volt pressure from most negative to second most negative. One response gave an answer of "good" because he mixed zero pressure from a completed circuit compared with measuring only the negative side. If i have this correct, the pressure reading for a good negative side should be 12.5 volt pressure. Is that correct? I'm going to get a battery out in a bit and tinker.
Actually, I believe y'all said there should be low pressure, but not zero. So you are talking about a completed circuit. So the ideal voltage drop for a resister is zero, but this never happens. Therefore, in reality, a pressure (not pressure drop) of zero is an indication of an open circuit. Is that correct?
Comborico when performing a Voltage Drop on the ground side place the neg lead to the most negative on the vehicle that would be the negative battery post...next step is place the red lead to the most or next negative of the circuit you are testing....make sure the circuit is on or VD is not being measured. For the positive side place the red lean on the most positive the battery positive post and the black lead on the most or next positive of the circuit you are testing. Think of the volt meter as a pressure gauge that is place in series on a line or pipe. You are measuring the 12.6 and testing if it drops to the next positive on the circuit your are testing. If the voltage at the next positive point is 12.4 you have a 200 mV voltage drop. On the ground side there should be very little left over after the pressure/voltage is consumed by the load in the circuit. If there is more than 200 mv on a non computer circuit on the ground side you have a voltage drop. I hope this helps...thanks for watching...check out are other videos...if you have not already subscribed to our tstseminars CZcams channel please do so. thanks
Thanks for the help!
your welcome...glad to be of help...have a good one
how do you check for battery drain
czcams.com/video/P-wxG6U5TuY/video.html&ab_channel=MotorAge
hi there. Is there any training seminars coming up in March of 2016? Where can we find out and what do we need to do to become a member if we have to to get access. Looking forward to hearing from you. Thanks for your time.
Hi Michael, We have a March 19thm 2016 all day training event in Fishkill, NY at the Ramada Inn. This is an all day event - and you do not have to be a member to attend. TST has generous sponsors this year - you can attend this event for only $75.00 - please email me if your interested at doreen@tstseminar.org I can send you additional information, or call the office @ 845 628-6928 or visit the tst website www. tstseminars.org. Thank you for your interest.
I have a Buick with no turn signal or wiper speed. No emergency flashes . been on it for a week . dealer work on it an nothing fixed that was a 1200 bill
OL on your meter means open loop
Not OPEN Loop but OPEN Circuit or Component. Thanks for watching and your comment. If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org
TSTseminars OL STANDS FOR OVERLOADED AS PER RANGE OF ALL FUNCTIONS ON A METER PER FLUKE I GET WHAT YOUR SAYING JUST WANTED TO ADD MY 2 CENTS BY THE WAY VERY GOOD PRESENTATION HAPPY NEW YEAR
If you've already answered this question in the comments pls forgive. I did try to find the answer on my own before asking you here. Here is my question...you mentioned a scenario where you get absolute zero readings on the ground side of the load after testing the positive side first and the load is getting full power. You said it was an open load. I am getting this on my SUV fuel pump and I'm not sure what that means. Can you help a brother out and clarify how I might remedy this pls? Thanks in advance if you're able!
I believe you are referring to a voltage drop test...the test needs to be performed with the pump running and the volt meter set to DC mV. Usually a good ground will have 20mV or less...on DC volts it may look like o volts. Hope that helps let me know thanks for watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing …Membership and over 85 videos for less than $200.00 a year. Also checkout www.attstraining.com for hands on training and webcast
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great video
+Cornelius Crenshaw Thank you!
You can’t have a perfect “0” on one side of the load and a voltage drop on the other, a perfect “0” indicates no current flow, a voltage drop indicates current flow.
Hey G hope all is well. I'm watching this video for the 5th time because i had a 2009 dodge charger with a compliant of inop horn, i performed a voltage drop test on horn circuit and it had me scratching my head. With the car running 1st push of horn on steering wheel the horn just beeps, 2nd push, noting from the horn. Fault in TIPM for horn control circuit low voltage. look at wiring diag, power is sent from TIPM to splice and out to both horns. horns grounded on rad support. When i place Pos lead to Pos side of Batt and Neg lead to Pos side of the horn and press the horn switch i get Batt voltage. When i switch the leads to Neg side batt and neg side of horn circuit i got 0v. When i disconnect one horn the other horn will work all day long. My question is in this circuit is the one horn shorted so it shorts the high side driver in the TIPM or i'm not thinking of another issue here. thanks for reading.
If you went from pos batt to pos of horn and got 12 volts theres your issue. You should not have that high of a voltage drop. If you go neg batt to pos side of horn when honking you would most likely get 0 volts . If I understood the video correctly a high voltage drop using pos to pos and neg to next positive is bad.
Isn't there a ground on control side of horn relay going into tipm? If you did loaded circuit test on that ground with light bulb. It would be very dim because of the resistance where the eyelit of that ground attaches to the body is corroded creating unwanted resistance.
In computer controlled ckt is voltage drop applicable?
Marga yes it is...Remember for a VD (voltage drop) test the circuit MUST be on. The maximum VD should be no more than 100 mV. Thanks for watching...If you have not subscribed to our tstseminars CZcams channel please do so. Restrained in more training? Go to www.tstseminars.org
Automotive fuses are more for wire protection, not circuit protection. That's why they need to be placed as close as possible to the battery, not at the load. The fuse needs to interrupt the power if a short or overload occurs anywhere downstream from the battery, so the most coverage is afforded by putting it nearest the source.
czcams.com/video/YaYtCVBodpw/video.html Wondering why the headlight on the side being measured is out- figured it was a simulated problem but it seemed like it was unexpected.
Wire is part of the circuit so your right as well...thank you for sharing some good information. Please subscribe to our tstseminars CZcams channel...interested in training go to www.tstseminars.org...thank you
Problem on ground side
@29:00! excellent tip: fuel pump issue
So there would be a issue on the ground side
not sure where you are in the video...please provide the minute and seconds and I will reply...thanks for watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com.
I am not a mechanic, but the people asking the dumbest questions is an eye opener. An intelligent young person could rise quick in this profession.... leave the parts changing to the brainless, leave the diagnosing to the brains...
Bill thanks for watching...if you have not already subscribed to our tstseminars CZcams channel please do so...thanks
Bill everyone needs to start somewhere....you don't know what you don't know...no one is stupid they just need to get up to speed. Educate or evaporate...thanks for watching ... .if you have not already subscribed to our tstseminars CZcams channel please do so. thanks
Good info, but I could not see where u are connecting meter probes sometimes. Lighting not too good
Holy moly! This is the most cumbersome an confusing video one could ever imagine! Even the camera man is put to sleep!!... :-(
Jan sorry you did not find the video helpful...there are many other videos on our channel that you can view. Can you explane what was confusing? Thank you for your comments...Thanks for watching...there are a bunch of other videos on our channel...enjoy we hope they help.If you have not already Subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and www.attstraining.com
@@TSTseminars Ok. Thank you for answering. I then understand you are trying to be serious...
But using 1½ hour with really bad sound and a camera focusing everywhere but where it should, just to make a statement that could have been done in a few minutes, made me wonder if it was a really long and really bad Monty Python kind of sketch!?...
Of course the statement is really valuable -that's why I came here at the first place! -and why I bothered to comment... And of course I honour people who are trying to help others! But this presentation really sucks! It is extremely tedious, and by making it 10 times too long you are just confusing it -and your self!...
-Really bad pedagogics, and with a video quality that I cannot for the life of me understand why anyone would want to publish???
Sorry guys, but this really doesn't make me want to see more of you! Only thing that might make me check you channel is the fact you actually answered here!
/Jan
Jan please review the other videos and let me know what you think? Thanks again for your comments...by the way the video I believe was from 2015...check out the new Voltage drop videos...have a good one
Uhh, the content is gold. Deal with it. They aren't working with million dollar production budgets here. Cripes...
@@janorre7496 Did you want someone to explain and demonstrate a numerous concepts in a 2 minute cartoon? Just pause and come back.
I tested my alternator and wires for voltage drop because the alternator isn't charging. My B wire has zero resistance, I'm hearing you all say that it can not be zero. Is there an issue with this reading? The local shop bench tested it and says the alternator is good. My connections are good and my belt is good. No fuse , but I do have a fuse link but with current flowing there's no drop.
If the Voltage Drop test is performed correctly the alternator has to be running...it's impossible to have a zero voltage drop since there is some resistance in every circuit. Try it again and let us know...please subscribe to our tstseminars CZcams channel
You're absolutely correct. I went back outside tested it again. At first zero then I realized I had forgotten to change the scale to millivolts. The reading was 30m. I've tried everything my neighbor who has been a mechanic for 30 years says he still believes it's my alternator. I'm leaning that way too the light goes on and off. Thanks for the response.
Correction it showed 30m on the ground side and surprisingly .6m on the positive side. I tried it 4 times
OK make sure that the fuseable link is good...try running a temp wire and see if it charges...also try a temp ground as well...keep me posted
I did try the temp wire I'll try the temp ground today
Dan Sullivans load pro test leads.
Dan's Load Pro is good but you still need to know how to do a VD test if you don't own a Load Pro. Thanks for your comment and watching...If you have not already subscribed to our tstseminars CZcams channel please do so. Interested in more training? Go to www.tstseminars.org and view full length videos for members on TechFlix for $9.99 unlimited viewing and www.attstraining.com for hands on training and webcast
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The real world test on the Jeep was disappointing. However, that’s been my experience with anything Chrysler.
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1:03:13, you confuse yourself, also confuse me.
The guy in the ponytail kills this whole "webinar"..
Sorry you don't like me...thnaks for watching....If you have not already subscribed to our tstseminars CZcams channel please do so.
TSTseminars you are an excellent teacher no matter what hair style brother .
Robert thanks...have a good one...don't forget to subscribe to our tstseminars CZcams channel
TSTseminars Been subscribed for years and learned a lot from your training .
I totally disagree. I think Jerry should be doing the lead on this video.
Let me guess, the camera person was too busy playing with their cellphone to get the relevant points in the camera viewfinder. Or even take a couple steps closer when needed. This is a great concept to teach a very important subject but it falls on its face as produced and presented.
Good effort Guys but hey stick with fixing cars.
Bill sorry you did not like us :( anyway thanks for watching...if you have not already subscribed to our tstseminars CZcams channnel please do so.
Aaaaaaaaaahhhhh.