Mercury Outboard Rectifier Swap

Mercury Outboard Rectifier Swap

Don’t spend $350 on a OEM rectifier for these old Mercury outboards when what you will get is a universal solid state rectifier/regulator available for cheap.

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@alansnobl4059 says:

This is great ! Exactly what I needed to know on my 89 100hp !

@timothycarey4629 says:

I have the small rectifier just installed a 16 amp stator wanting to convert to the voltage regulator rectifier do you need the grey 3 prong part or could I use the rectifier I have and just add the 6 wire one not sure what the purpose of the 3 prong part with the 6 wire setup

@TheCahazuka says:

Awesome!!!!
I have an 1987 80HP mercury. Cylinder 1 started misfiring and I found out the rectifier was melted. Replaced the rectifier and that corrected the misfire but now the voltage is staying up to 17.5 I have replaced the stator and another rectifier/ regulator. Still 17.5 volts went back to the old rectifier and now I am seeing 60VAC from the stator and 60DC out of the stator. I am thinking I am overlooking something, just haven’t figured out what I am missing.

@geraldoakley7688 says:

HI, I have the exact same motor, I have had a misfire on one cylinder for a while at Idle, and have decided it’s the stator, I am wondering if I need to change the rectifier/regulator as well, How do I test it before I order a new one, it does charge the battery

@giloquendo says:

Great video what color is the cable that goes from rectifier to the battery

@braddistler5697 says:

Literally answered all my questions in one video. Thanks a million.

@gilfredooquendo9969 says:

Question that skinny black wire grounded to the starter where does it comes from

@gilfredooquendo9969 says:

Instead have done something wrong cause when I changed the rectifier the tilt trim now doesn't go down

@gurkha184 says:

You do have to hook the other red wire to the starter solenoid,it's the sensing wire,if you don't,it will only put out about 7.5 volts.13.5 after I hooked up second red wire

@gurkha184 says:

Your a life saver,Thanks for the video!!!

@davidcloutier6771 says:

I have a 1989 90 H.P. 3 cylinder 2 stroke and have had the same level of confusion with trying to troubleshoot my battery charging issue. This video was very helpful in helping me sort through a few things. The unfortunate thing for me is that the voltage regulator part no. is obsolete at this point. Curious as to what the part number was for the regulator rectifier that you installed.

@swinada says:

thanks this is the only video i was able to find which showed the system I have on my 1990 90HP Mariner outboard. I also ordered the the small rectifier with the 3 posts and then got confused as it didn't look like the one I had on my motor. Now I know what to look for . Thank you very much this was very helpful. Did you measure your voltage output when you're cruising at higher RPM? Does it stay at around 14.5?

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