CEN-TECH 69368 Battery Charger Repair
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- čas přidán 1. 02. 2022
- In this video have a CEN-TECH 69368 Battery Charger for repair. This belongs to a friend at work and He thinks it was connected with reversed polarity. The parts for the rectifier are now obsolete and we had to improvise with what I consider an upgraded diode type for this charger. I have used the stud mount Diodes many, many times over the years and rarely seen failures. Hope you find this video helpful and thanks for watching!
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Hello Thrifty Tool Shed. This is an update to my copy cat replacement of all 6 Diodes on the Rectifier plate and the re-wiring of the Diodes. It took a while to collect 6 new diodes and when they arrived, I watched your video again, then copied your solution. The parts I used were all new. 10 AWG wire and #6 ring terminals. Following your instructions made this a doable project. First, I removed all of the old diodes from the Rectifier plate and replaced them by drilling holes for the new ones and attaching them. Then I carefully re-wired all 6 in sequence like the diagram you drew. After re-attaching the positive wire to the plate, I used a multimeter to test my work. It displayed numbers similar to the numbers you show in the video. If I had not found your video, I would have just bought a new charger. You showed me the way and I successfully repaired my old charger and saved money. You are a good teacher. Thank you and happy trails to you.
Awesome job! Thanks so much for your kind comment! It means a lot.
Definitely the best video out there on these chargers. Thanks for putting it out.
Thanks so much for your kind comment!
Thank you so much. This is the style diode my friend had fixed one of my chargers with. I want to upgrade another charger the same way he did with these. I wasn't sure of my memory. Thanks for the confirmation. I can now proceed with confidence.
This is got to be one of the best video I've seen it was very well understood thank you
This is about the fifth video I looked at on how to fix a charger. This is the only one I've looked at with the 200-amp start option for the charger. That's what I'm working on it is a Schumacher. Funny thing at the parts store at Farm and home store I was asking if they had a fuse available for it. It look like I speaking a foreign language and that I was nuts. Fix a charger just go out and spend $350 or more for another one. The charger has saved dozens of batteries for me. so now I'm going to take the case off and see what I find. Your video is getting me off to a good start. Thank you
Great video I had an old non-functioning Chicago electric charger given to me very similar to the one in your vid - saved me a ton of time - thanks!
Good work! Enjoyed watching.
Thank you so much for helping me yet again 😊
Thanks, I assumed I had a shorted secondary, and I guess the cost of a new XO is probably more than the charger itself. This saved me some money, and the diode recommendation is solid.
Awesome! Glad it helped!
Brother you are awesome. Thank you for your helpful video
So glad you found it helpful. Thanks so much for your kind comment!
Nice work.👍🙏👍👍
Great video, I'm subscribed!
THANKS. you make a very professional vid!
Thanks for your kind comment!
One small problem bro. You cannot put non identical diodes in parallel. Different diodes have different voltage drop across them. It's like putting a shelf in a couple parallel boards. The longer one will carry the whole load. The bad thing for diodes is that once it get hot, its voltage drop goes lowers and this exacerbate the diodes getting hotter and other diodes doing nothing. Eventually the diode with the lowest voltage drop will burn.
I completely understand that and I guess I should have talked a little about that as well. Since I mentioned that they could handle 50A on their own and only ever get a good push when in 200A boost that is obvious with the size of the wire it is not meant to handle more than a few seconds of that. I have had no issue with that in mind. If I was working on a system pulling close to rated current of the diodes in question and with more use than an occasional battery charge I would have absolutely changed all the diodes at once as you could tell the original ones I left on the plate were not as close in voltage drop check as I would like in a system design. Very good point, I should have spent a minute talking about this a little. Thanks for sharing!
Thank you for your fast reply. After I sent my comment/question, I went back and watched the video again. Then I heard you say you needed to add more ring terminals. Since I am replacing all of the Diodes with 70Amp 1200V replacements, do you think I should use a wire with a 12 AWG instead of the 14 AWG you used? I confess that I am merely being a copycat and trying to do what you did. Monkey see, Monkey do. I'll be really careful and hope I have the polarity in the right direction for all 6. Again, I appreciate your patience and kindness in the explanations you provide. Thanks again.
I would absolutely use larger wire like 10 AWG or at a minimum #12. Excellent point.
very helpful .thank you. i have 225 amp schumacher charger probably 40 years young , has 2 diodes on rectifier plate . one of them is bad, will the one in this video work properly for me ?
Thanks for your comment! I do not know this model to say for sure, but if only 2 diodes and rated for 225A I would assume the diodes are rated higher than the ones I used here?
Thanks for the simple, down to earth video. I’ve got 3 dead chargers, identical Chinese 2 or 8 amp models. Transformers seem ok, just over 6v at the rectifier on 6v setting, and same for 12v setting, just over 12 v. After the rectifier there is a circuit board with 4 leds, showing how many amps are flowing. All 4 are lit up, with only 2 or 3v DC at the output clamps.
There are 2 fairly big white square resistors (I think) in parallel, showing 7 mega Ohms on the meter in one polarity, and no circuit in the other direction, which seems unusual. They are marked: 5W 0 Ohms 5 J.
Would you suggest replacing them?
Yes I would. The 5W resistors are most likely ceramic power resistors and should read close to zero ohms according to what you wrote above. Best of luck to ya!
I have the same unit with the same issue. I found one of the black wire for the fan motor on the floor of the casing. I do not know where it goes. Can you help?. Thanks for a great video.
Hi,
I did not even get a good still of where the fan wires go since I had no concern for the fan with this one. I have of course since given this back to my friend. I would say that it goes toward the wire nuts in the bundle you can barely see at 1:06. I think that makes sense because the timer. 120VAC is what is going to the fan. Some of these switch the neutral and some switch the hot. Either way one of the black wires from fan is going toward the hot and the other black wire is going toward the neutral. Find where one side of the fan connects and then it should make sense. Thanks for your kind comment!
If all of the diodes (3 x 2 = 6) are replaced individually, how would it be wired back into place? The charger came with 2 diodes per holder, and the top tier only has 2 wire connectors, and the 2 lower tiers have 4 wire connectors. I am new to solving electronic issues and could learn from your expertise. Great video too. Thank you. Merry Christmas too.
Hi,
I did show at 8:55 the diagram of how this one was wired if yours is similar. Make sure all diodes are going the same direction as the original. Mine was all 6 cathode to the plate. You can also buy higher amperage diodes and get by with 4 instead of 6 if you desire. Thanks for your kind comment.
Hope it helps and Merry Christmas to you as well!
I liked your video, thanks for the knowledge, i have a cen-tech heavy duty item 62292, 6/12 volt, 2-10-40-100-200 amp battery charger, i bought it used & when i try to use the 200amp it kicks in for about 1sec. & then out, on the 40amp it runs alittle longer then kicks out, the 2 & 10 amp works ok, do you have any idea what ishould check, thank you Dennis K
Thanks for your kind comment. Sounds like a possibility that the thermal overload is opening up. Some models have this built into the transformer and on most it is external. Could be a faulty thermal and it could be really drawing that much current (like a bad diode or such). You will have to test current through the thermal and see. A DC amp clamp DMM maybe your best friend here. Best of luck to ya!
@@ThriftyToolShed thank you
What was amperage rating on newer style diode? Will there be an issue with miss/matched diode design?
In the video description I shared links to the 70A version. You can find even higher current type if you want to reduce the number of diodes honestly. It is a concern for mismatch of diodes since some will end up carrying more load than others if not properly matched or purchased together. I typically see no issue running these in the under 50A charge range and even the higher current ranges if used for the typical boost mode temporarily. You may end up seeing more unbalanced current the higher current charge level you charge at.
I have an old Schumaker battery charger that needs both diodes. It is 6/12 volt 2/6 amp. All of the stud diodes that I can find are 70 amp. Will that work or should I use something smaller.
They will work fine, just Overkill. You can get by with 10A or 25A easily if you can find some.
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Or
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I have the same unit and the same problem, but I had a burned out diode in each group, so I have to replace all the Dios. Question! Would I use the same Doud for this unit? I bought six new diode and I’m getting a Feedback.
I would think replacing all 6 would be great. As long as polarity is observed and put back the same way. Are you saying you are getting a feedback after installing them?
Was the black wire output battery cable connected to the center tap of transformer ? The red output positive battery wire was connected to the rectifier diode plate.
Yes, the best I remember. The black cable does go through the current shunt and circuit breakers before going to the transformer if I remember correctly.
@@ThriftyToolShed thank you for your response.
how much A/C in the presence of the D/C is acceptable? My 36 volt charger diodes tested good yet output was 36 volts D/C with 6.3 volts A/C going to the battery. I made a new diode plate with new diodes and shows everything correct yet now get 1.4 volts A/C in with the 36 volts D/C
Well, A simple charger as this one is a center tapped Full Wave bridge output. So with no filtering you can easily go as high as .483 ripple of voltage In. So roughly half! These chargers have no filtering at all. It is the battery that is the load and also is filtering the output to some level. It would depend on the charge level of the battery being charged and if the leads are even connected to the battery or not as how high the AC ripple is?
Your video was most helpful, I changed out the bad diodes but it is still Only out putting around 8 volts. Does this mean the transformers bad? Not sure now what’s wrong?
One thing to check is that it's not still in 6V mode. The selector switch may have issues if not selecting the correct transformer winding. Thanks for your kind comment!
@@ThriftyToolShed thank you for replying, turns out another diode went bad. I am not sure why. I think I am done, not going spend any more time or money on this. Thanks
Where would be a good source for a replacement amp meter for one of these large units? Mine wasn't working so I removed it.
One example place I see that has some similar panel meters is the link below. This is only an example of course, I have not ordered anything from them myself! I can't recommend since I have not ordered anything similar except some eBay purchases similar when they show up from time to time. I sometimes have saved searches on eBay in case an item shows up...
www.plpbattery.com/collections/amp-meters-volt-meters-accessories
Great vid! I have a very similar charger with the same burnt diode problem! What diode rating should i order and where do you like to get yours? I would like to replace all 6 if not too expensive.
I have a link in the video description from back when I replaced mine. It's an example link for the 70A actually. The exact link for the ones I used is no longer available. Best of luck to ya!
Never mind I just saw the screenshot of the diode you ordered!
I hope it may be back in stock. It was out of stock about a year ago so I ended up removing the old link and added some 70A versions as an example of a similar diode from Amazon. Even though it is not the exact one as was shown in the video! Best of luck to ya!
i thinks can this help me whit Schauer cr612 maybe happens the same voltaje its 11.50 but when i connect any bulb or light , battery the voltaje drop 0.15
Check for loose connections, it could even be something with the transformer or thermal in the transformer if it has one. I would check all the easy stuff first by checking point to point to see at what point the Voltage is dropping under load.
Are all six of the diodes rated at the same amperage? (50)? I have the exact same charger with the exact same issue lol I'm going to replace all the diodes with the ones you suggested.. i think i need 6
Yes, all should be rated for 50A if it is the same model!
@Thrifty Tool Shed I like your content. You've earned my subscription! We live in a throw-away consumer society nowadays, and I'm not too proud to benefit from it when the opportunity arises.
I've seen others change diode with bridge rectifier that have a diode in them? Whats the difference in the one you installed?
Typically speaking the bridge rectifiers are lower in current rating than the large individual diodes and it has four diodes together internally used for full wave rectification. This charger is using half wave rectification.
I have the smaller 2 / 8 amp Cen-tec charger. If I replace the diodes will it put out more amps?
Is so, diode like the ones you used or the smaller square ones or a full on bridge rectifier?
I'm more mechanical than electrical. Lol. Thanks for all the information.
You will be limited to the current rating of the transformer as well so not only the diodes amp rating, but the transformer as well.
I have a smaller cen tech battery charger, it turns on and off constantly, on for 10 seconds off for 30/40 seconds??? I got no idea if its normal. Do you have any ideas why and if need be what to check to fix it?
It is possible it is shorted out similar to this larger one. It can be shorted and hum and maybe the internal shunt or circuit breaker is opening up and then cooling down and cycling? Does it have any DC voltage actually coming out of the leads when it is on?
@ThriftyToolShed The meter does not rise at all but you hear and see it go on and off. It's one that has 50 amp 10 and trickle 2 amp. Never used much.
Will not turn on is there fuse or reset,on new style
I would think it would be a fuse for protection for sure. I don't have the new style to say for sure though. Best of luck to ya!
Very nice video
I have also channel in CZcams
Thank you!
Jesus loves you and he lives
Amen! So thankful that He loves us all!