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88 hp johnson voltage output queston

F

flyrod

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output up around 17 volts when

output up around 17 volts when running at 3/4 to full throttle.Is there cause for concern? Should I replace the voltage regulater?
 
You don't give the full mo

You don't give the full model details so difficult to be absolutely certain but I think 88 models only have the round rectifier which is not a regulator. If so then the volts can easily rise to 17 v or more. Surprising though if you are seeing this with a battery connected.
 
"sorry- new to the board, I ha

"sorry- new to the board, I have a 1995 88 h.p johnson model # J88TSLEO.When running at 3/4 to full throttle its putting out around 17 volts.On the voltage guage and the volt-meter, both the same. I dont know if I should be thinking about replacing the voltage regulator.Not sure where it is located if I have to."
 
"It appears that the 20" m

"It appears that the 20" models had the round non regulated rectifier, while 25" models had the water cooled regulator/rectifier.

The model number indicates a 20" model which means that there is no regulator and 17 volts could be possible.

Check which rectifier is fitted. If it is the round one then nothing is wrong. If it turns out to have the water-cooled rectifier/regulator then it is suspect.

Both types are shown in THIS DIAGRAM #66 is the round non-regulated rectifier. #69 is the water-cooled rectifier/regulator.

The round one is located on the side of the power head near the terminal block #63 to which its wires are connected. The water-cooled one is mounted on the very top of the power-head but on 20" models there should be a cover and lifting bracket in that position."
 
"In agreement with VicS. If &#

"In agreement with VicS. If "Water Cooled Reg/Rec" assembly, that would be my suspected component."
 
assuming you have the round re

assuming you have the round rectifier that is mounted on the side near the terminal strip...seeing 17 volts happenings on this motor and with this charging system will occur...there is nothing wrong with the rectifier...this normally happens when you replace the battery with one rated too high...if you have a tach then you will probably see it fail also...try adding a load to the system..turn on running lights or plug in a 12 volt cooler...both if you have them...this will increase load on the battery..try going with another 'cheaper' battery....the battery recommended for this motor is actually somewhat smaller than i have saw in an auto store in many years...the rectifier is working as it is designed now but it will crap out eventually if the problem is not corrected...i will try to find a writeup by morten and post it...
 
read thru the above problem an

read thru the above problem and you will have a better understanding of what is going on....this problem pops up on here at least 3 times a year...design error as far as i am concerned....but that motor was designed long ago when batteries were of a different generation also...
 
"This is the first time that I

"This is the first time that I used this information board and I believe all the information that I revieved,thanks.I think I'll get another regulator for a 90 h.p and install it behind the flywheel. many thanks."
 
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