Charging a battery from an outboard
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- čas přidán 1. 04. 2017
- Adding a regulator / rectifier to an outboard motor so you can charge a battery is a relatively simple job. You need a lighting coil to supply an AC current that the rectifier will convert to a DC current for storage in the battery.
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this guy is the best, the only channel you need for outboards
Thank you! I unknowingly bought an outboard without charging capabilaties and thought I had made a big mistake. This saved me much time and headache.
I have an 73 9.5 johnson what wires produced your hot AC current
Perfect timing - I was just mentioning a Regulator/Rectifier to a my nephew for his little tinny...
Once again Stu to the rescue !!!!
Thanks Jason, it is a perfect little upgrade that is easy to do and doesn't cost much.
Just bought a boat with a '94 20hp Yamaha. Green wires are right where you showed them and I'm saving a fortune thanks to this video. Subscribed.
Thanks mate, glad the vid helped you. :)
Every time I have a question for my Yamaha outboard, I hope it leads me to this guy. Thanks for your help on this and for the help on changing my impeller! Keep up the good work!
Glad to help!
Every Yamaha question I have always leads me here.
Thanks again I was quoted $280 to fit a rectifier to my 8HP Yamaha and after watching your vid I purchased one for $40 and fitted it myself in 5 mins
Nice work! Glad to hear you managed to save yourself so much money. :)
Hi Dangar i have a2005 evinrudr j40rlsoc i want to add an starter but only four wiers come from under fly wheel. How do i conet
eric onealetorchon It gets expensive. You have to have a different flywheel, starter, and electrical components. If you can find a parts motor for cheap do that. New OEM parts will cost more than the outboard is worth most times
Can u tell where to purchase the rectifier..I'm looking for Yamaha 30hp hmhs engine
a honest well price shop is what you want and that one doesnt seem like its the best option
Great video Stu! That whole install looked like a factory job when you were done. Didn't know it was this easy to add a charging circuit to an outboard that wasn't equipped with one.
Thanks mate, yeah, it's a pretty simple part install. It's always nice for something to be easier that you think it is going to be for a change! ;)
Awesome vid champion, I was quoted $160 plus labour to fit it!!!
I bought one for $60 and with your help fitted it in 5min.... Legend!!!!
thanks for your videos mate. I had wondered if this was possible but was actually watching your other video about unseizing an outboard when I saw this. you've got a great balance of describing things in detail for novices yet pushing ahead to get to a point. thanks for sharing your tallents and taking the time to make these videos.
You're welcome mate, glad you are enjoying the videos. :)
Thanks Stu, love your videos, I’ve learned so much from watching, You explain in a manner that everyone can understand. Wish you would do more of these tutorials again
Thanks stu,this helped me out alot.found my motor was wired up wrong when i looked at it.now fully charging the batteries.
cheers mate.
You're welcome Alan, glad the video helped you sort your problem out. :)
Hey, thanks alot for the support. Have a 6hp yamaha on an old aluminum fishing boat, currently restoring it. This is exactly what I needed and ended up saving me over $100!
You're welcome Kyle, glad the vid helped. :)
Exactly what I've been looking for! I have a pull-start Yamaha 25hp 4-cycle that came without a battery charger so I've been charging the batter via solar panel after every trip. Yesterday on the water, my deep-cycle battery crapped out just at dusk, leaving me a couple miles from the marina on busy Chesapeake Bay without running lights. Made it home safely and today, after looking under the engine cover, I've found the two green wires (plugged) just waiting for R/R installation. Thanks so much for posting your video - it's solid gold! Cheers!
You're welcome Arnie, glad the video helped you. I don't think I did it in this video but you might also want to add a 10 amp fuse between the battery and the R/R.
Another excellent video Stu, easy to understand and simple to follow through , many many thanks, john
You're welcome, glad you liked it.
tip : now connect the front socket on the engine back into the +_ 12 line regulated, then when night fishing connect your handy spotlight 12v into that front socket, after done disconnect replace the plastic plug to seal it off again, makes for a good 12v accessory plug. :) my 2.5 hp had no ac coil, so i added one, used bridge rectifier, lm317, 2n3055, and a zener 12v witha adjustable pot, set to 12.9v , whalla...12v on a 2.5hp mariner, at 4 amps :) works like a charm. good video as always Dangar.
Another excellent video 👍 I used your bilge pump installation video to get my bilge pump installed, now you have an excellent video on powering battery/ accessory from an outboard. I just want to run a nav light for nightime. Hopefully I won't need a battery, I will just try wiring to the accessory wire provided on the converter. Cheers again 👍
Thanks Danger! Learned quite a bit and I appreciate you making the video.
Hi Stu, I'm a new subscriber, thanks so much for your videos, so helpful
Doing my own repair work and service on my second hand boat I brought,
Just from watching your videos,
Thanks again
Keep the videos coming
Legend! Such an informative video. Thanks mate!!!
I love your videos so much. You are always the first place I go to for advice, you usually have a video. If not you always reply. Really thanks for these!!
Also do you know if a 1969 65hp merc and 1972 80hp merc have interchangeable throttle cables? I switched the 80 onto the 65 hp cables and it seems to have a much higher rpm than before. Like the cable is too short and keeping the throttle open, dont really even need the warm up lever. Boat still runs and drives, but is a large clunk when put into gear.
Hey Nick, I'm not 100% but I would imagine they should be interchangeable. I would measure the travel of the end section from fully retracted to fully extended and see if they are the same, that is the critical measurement.
I will have to check that measurement tomorrow. I got the cables to fit and I took the boat out fine, but when I shift from forward back to neutral the cable doesn't close fully to the neutral position and the rpms are very high. Then while it is still in high rpms I can move the throttle down with my hand on the engine. So it seems to have the reach, and is a little stuck? I just saw your video on lubricating the cables. Im going to see if i can just apply some if that will help, if not will try what your video suggest. Thanks!!!!
great, simple, i can figure this out now- much appreciated from Canada!
You're welcome!
I will buy a shirt because you really have helped me soo much and i want to show my gratitude. Thanks youre ACE
Thanks! Exactly what I needed to know! Your drawings are very helpful
Thank you for posting this install Stu!!! I needed this to make sure I was doing this properly, good on ya man. Old video revival 😅
This was absolutely amazing. Thank you so much!!!!! Helped me like crazy just to understand the basic concept.
Very informative video, you save a lot of people so much money. Thanks.
Very helpful as usual Stu! Thank you.
Nice job mate. Gonna do this on my 8hp once I get the thing running!
-Jack
Thanks Scotty! :)
I know this video is 5 yrs old but its Awsome! I ordered the rectifier and a charge coil. My 1973 has external coils and an empty spot for the charge coil! Going to be nice to charge the battery a bit
Thanks, I really appreciate the clarity.
You're welcome Ken.
Really great videos, and you've inspired me to service my own boat. Could you recommend some must have tools for the job?
Really helpful and comprehensive- thanks!
Nice work Stu.
Thanks Will! :)
great job stu as always you explain it in should a easy way cheers
Thanks Jimmy, glad you like it. :)
Great video Stu..easy to follow and a cool addition to add that functionality to a smaller motor. Nice calendar too : )
Thanks Mark, it is a nice easy install, that's for sure. We buy enough stuff from Wurth, it's about time they gave us a calendar!
Dangar Marine used to use Wurth products when I worked on Swiss made monorails. Even though we are in the US they specified only their chemicals were to be used on the trains. We would go through many cans of their Rost off penetrating oil. I loved the smell of that stuff!
I cant get enough of these vids.....I hope u never run out of ideas. Hope u dont mind but I think Im in love with your calendar girl in the background. Wow.......
Thanks mate. The list of suggested video ideas grows faster than I can film them so I think we'll be alright for a while. Unfortunately she has now left me, but April has arrived so that's okay. ;)
awesome as always
Thanks Greg!
Great video, like always.
Thanks Terrence.
ok!! thanks for the quick response..
I know that this is an older video, but just last week I was wondering it this very idea was even possible for my 9.9 hp Mercury outboard.
I'm a great outboard mechanic, just not the best at electronics!
Now to investigate whether my little "kicker" has the lighning coil installed already, or not.
Thanks Stu, I really miss your outboard videos, even though I understand your desire to move forward with your new trawler.
Float safe!
Did you learn any more on this? I have a 20hp 2 stroke and want to add a charger. Mostly for running lights and electric start. Maybe depth finder.
@@Anthony-du3he I've looked under the flywheel of my 9.9hp Merc, and I don't believe that mine has the needed part. So I'm out of luck.
😮30 hp etech marine engine does not charge the battery. What can I do? I wish you a good day, my friend
Nice job stu. Thanks
Thanks George. :)
Thanks for the video , i know now what to do . I have a Tohatsu 9.8 Hp fourstroke 2005 . Greetings from The Netherlands
Graag gedaan! :)
this isn't Lesley, but Ken George, i use her computer, - i like your videos, and for me the diagrams are as important as seeing the cabling going in. The explanation while drawing it is a necessary part of the vid. please dont leave them out in any similar vids. I appreciate it. well done
Cool, thanks
Thanks for making this vid mate Its helped us out big time Cool channel You have a new sub
Thanks mate, glad the vid helped you out. :)
Thanks Stu, very informative as always. Clear and concise. Keep up the good work mate. You have a good grounding in electronics too by the looks. It sure helps doesn't it.
Stu, I think you need a new battery in your wheel clock in the background there mate, I noticed the second hand just bouncing. Mine does the same sometimes when the battery is low. LOL.
All the best and Cheers,
Bruce.
Thanks Bruce, glad you liked the video. :)
Nice work stu
Thanks Dean!
Vids like this is why i watch utube....thank you
Thanks John, glad you liked it. :)
Thank you Thank you!! Will buy you a beer next time I go to Oz
Very helpful thank you
cheers m8 helps heaps as i am planning on running led lights and add ons thank you m8
You're welcome, glad the video helped you. :)
great vid bro thanks. tis the season for playin with the boat. peace.
Thanks mate, yes, finally time to swap summers. :)
Great vid. Super clear. Thanks, Cheers
I was wondering how to do that. My brain just got bigger. Thanks for the brain juice dude!
Not bigger, more efficient, lol.
Hi Dangar Stu love your videos Just added a Bridge Rectifier to my Yamaha 30 Hp nearly identical install as you showed on your video. Point to note I bought a 50 amp Rectifier off Ebay for A$5.00 does the job nicely A fully sealed unit and works perfectly Cheers Phil
Hey Phil, glad you like the vids. :) Yes, there definitely are some cheap alternatives to the original parts out there.
I'd love to see a pic of the rectifier you got (is it also a voltage regulator?), brand/part number.
Gogle Plus Sucks send me your email address and I will forward you the pic and a wiring diagram mine actually cost A$1.99 haha
That’s kool. Thanks for the informative video.
Thank you, well done
Thanks for sharing
As always great job ! ;)
Thanks Artur! :)
Hi mate i wish i had known about this when i had my enduro ,always taking the battery out and it was a pain as i had set it under the side consul ,oh well boats been sold now but it would have been nice take care .
Amazing tutorials thank you so much!!
I have a main ( starter battery ) and a sneaker motor battery. can i use a second regulator to charge my second battery ? My motor is a 70 hp Yamaha 2 stroke:) thanks in advance
I have a 15hp Mercury. It’s got some wires there. Hoping this works!
Hey mate, great video ! Perfect for what I’m looking at doing! Just wondering do you see any need to put an inline fuse in the line before the battery ? Thanks again!
Hi Stu, love following your progress and informative, entertaining videos rebuilding Renko.. esp look forward to the chook segment at the end! I've just watched your video on fitting a rectifier on an outboard to charge a battery. I have a 22 ft twin keel yacht built in the 70's I'm restoring. It once had a small inboard diesel but that was long gone by the time I got her. It came with a 6 hp Evinrude outboard which looks like has been around the block a few times, is a bit smoky but goes ok. My question is what do you reckon is the smallest size outboard that can realistically deliver a charge to a boat house battery if run for a few hours and how would you link that with solar panels in the system. Only want to run lights, depth etc for short periods. Cheers, Steve
Any idea on the DC wattage out from the rectifier? I'm wondering about using this to feed back into an up-converter to charge a 24v battery system that runs an electric trolling motor... but I'm guessing it won't output enough to make that worthwhile. Thanks for posting your work... really helpful stuff.
hi stu I was going to do this but went for a sola setup instead which works really well
Solar is a bad way to go. I'm planning to add a panel to the Green Machine some time and do a video on that too.
Solar is NFG for keeping the lights on at night
i have to wires comes from outboard yamaha 40 hp which one is negatives and the positive to connect them to battery? how to know
Fantastic
You need to do a video installing one of these on an electric start motor and if you have a battery switch where you cut the batteries off or just run battery one car battery to or both batteries if it makes any difference of having that and tell if it will charge both batteries at once or if you have to switch between both batteries. Keep up the good learning videos
Thanks, good vid.
Thanks mate. :)
THANK YOU !!!!
You're welcome Luis.
Great vid. Is there any reason you didn't just hook the fused wire to the other plug you unhooked? All the wires are there and could be put to use. Thanks.
Thanks Tim, yes, could certainly have done that, but I doubt it would every be used in this particular case. It is a good idea though and certainly no harm in doing it.
Hi Great information, thanks. If the outboard is used without the rectifier attached to a battery will this damage the motor or rectifier? Thanks for your help :)
hey stu do u have a video on adding a 2nd battery like for trolling motor to the system?
Not yet, but I will be filming that very soon!
Once again a great video mate.I really enjoy all of them.Glad you made it clear to the viewers that the higher the rpm the more voltage you'll get in the battery compared to at idle.Quick question from me is,where would you recommend I source a good workshop manual for my 30hp yamaha cv preferably in book form?Thanks for all your time and effort you put into the vids. Fabian.
About the only way to get a read service manual is to order it as a part through a Yamaha dealer, but some have contracts that prevent them from selling them unfortunately. Otherwise, try finding a pdf one on readmanual.com or tradebit.com and then get it ring bound at an Office Works or something. That's what all my printed ones are.
Cheers mate.Ill have a look.
Hey stu, any chance you will be doing a vid on converting a tiller outboard to forward control? love the vids mate, keep it up
Yes! I was just talking to a friend about that on the weekend as he needs to do that job on his boat. Stay tuned!
InlineLocally2037 has
Would you recommend putting a fuse between the rectifier/regulator and the battery when doing a install like this?
Hi,
can you give us a link for the rectifier?
Great job btw!
Hi , excellent information. What cable gauge do you used for the battery on the Yamaha F15 outboard ?
Great video. Could you show how to test if such a retifier is working. Im a bit unsure if mine is working. Best regards Henrik (Denmark)
thanks, from U.S.
hey there, your video is great information! what would i need to do extra if i have dual batteries?
There is nothing extra you need to do if the motor is electric start and the regulator / rectifier is connected to your starter motor wires. As it produces current it will be sent to whichever battery is selected on the switch 1 / 2 / BOTH.
Very clear thank U.
You're welcome Jon. :)
Hi Stu, Great vids mate, l have converted a 1991 40hp Johnson tiller to forward controls and removed the gas assist ram, dismantled the ram and converted it to hydraulic tilt trim using a remote pump unit from an old chrysler motor, l now need to charge the battery from my motor but have no idea if the motor has the ability to charge or if it is convertible. Could you wise me up on if and how it could be done.
Cheers Plussy.
Great video Stu. My '86 Johnson 90HP V4 is calling for a $350+ reg/rec part. I am thinking it seems like I could just use a $25 Yamaha 100HP/Mercury 90HP reg/rec instead. Any thoughts on this idea? Stator I have is supposed to be a 3/9A. Any advice on what to check or watch for?
The existing AC out plug is a pretty convenient way to connect the battery to the motor if you don't leave the motor on the boat. They're not that expensive.
Hey Stu . Firstly thanks for your content , I am not really a boaty but I have been watching your Renko build since the start. I have recently brought a little tinny and I have installed a regulator rectifier , what size fuse is recommend or what is the amperage output of the regulator rectifier is ? I'm thinking less then 10amps?. Can I get away with a blade fuse ? I have midi fuse already but the lowest rated fuse for those is around 25amps . cheers .
Thanks Stu for a very clear explanation. One question: Is the rectifier sophisticated enough to prevent overcharging when running the outboard for many hours into a small, in my case, LiFePO4, battery? If not, I guess a DC - DC convert it would be required?
Hello Dangar Marine, your videos are VERY INFORMATIVE! 👌🏿👌🏿
I was wondering if I can attach a regulator rectifier to my 1974 Mercury 110 9.8hp with thunderbolt ignition being that it didn't come with one, can I piggyback one to it just as you did in THIS video?
Not sure if that motor has a charge / lighting coil under the flywheel, but if it does then sure, this would work just fine.
Hi stu, good video also this time, one question, do you know the Gear box ratio of the Suzuki DT75? Or can you do a video on how to find it? It is usefull to find the right propeller
I don't know the gear ratio off the top of my head, but other than Googling it you can also mark a spline on the prop shaft and count how many times it rotates as you turn the flywheel through on complete rotation to give you the ratio.
Good video. I have a 18hp Tohatsu that needs a regulator rectifier fitted. Thinking of using a secondhand one from a motorcycle wreckers. I suppose it should work if it has 2 AC wires feeding in and 2 DC wires feeding out along with a earth wire ? Im doing this as theres little to nothing of information about Tohatsu wiring
I think you'll be fine. Rectifiers are pretty simple and standard circuits. The only thing is making sure they are able to handle the current you are putting through them but a motorcycle reg on an 18HP should be fine.
Thanks for good information. Isn't there any concern of overcharging?
Nice
helo mate thanks for the knowledge videos.
You're welcome. :)
Im still using an old school 20hp 2-stroke evinrude that does not have an alternator and it sucks. I'm so ready to get a four-stroke for multiple reasons, a charger being one of em'
You CAN add the lighting coil to older motors. Extra work/cost but certainly doable if they're not too expensive. Buying used would save a lot. I'd love to add both electric start and charging to my old 15hp Evinrude (it was actually available with either OR both) but since not many came with electric start, even used parts are hard to find at reasonable prices.
Is there any specific advantage to grounding the motor to the rectifier and battery, vs. just connecting the output leads to the wires to the battery? I'd think NOT connecting to the motor would lessen any chance of charge eating through an aluminum boat, or even parts of the outboard? Also, do you think the outboard will actually push 10 amps, hence not using the fused connection? And do you have a fuse somewhere in the battery hookup in case there's a short?
Thanks for another great video.
RichE
You can't really avoid having the engine block as ground as the motors own factory component rely on that, the trick is to make sure you then have a good wired connection back to the battery negative so that the path of least resistance doesn't take the current through the hull. It's a good question about the fuse and one I was thinking about too. It would be interesting to find out the maximum current output of this regulator and put a fuse in line. I guess they don't traditionally because they are connected to the battery leads that are unfused as they need to supply the starter motor. Given these wires are much lighter though they could use some protection from a short to stop them from melting.
Can you do this setup for a deep cycle battery or more for a startup battery
Hi
Is there a way that i can measure the wire with a multimeter before i can connect it on the selenoid?
Hi Stu, Thanks for posting vids like this, they are very helpful! I have a question for u; I just bought a brand new 8hp Yamaha 4-stroke high thrust motor. I want to add a rectifier but the Yamaha rectifier the dealer proposes to me seems so quite expensive for such common a piece of electronics. In your video you say that rectifiers are interchangeable, even between brands. Can you advice on an alternative rectifier for my motor? Thanks and keep up the good work!
You might be able to find something like this on AliExpress www.aliexpress.com/item/664-81970-62-Rectifier-Replaces-For-Powertec-Parsun-Hidea-30HP-40HP-Yamaha-Outboard-Engine-Parts/32708750252.html or an aftermarket alternative from Sierra, but with the amount of current you get from an 8HP motor I would also consider going doing the solar cell route to charge a battery.
Again, great video. Would you know if I could do this install on a 1972 Evinrude 25hp. Thanks
I'm not too sure. I've never worked on an older Evinrude but I'd be surprised if it didn't have a charge coil already installed by 25HP.