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1973 115 Johnson voltage issue

T

texas17

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"Hey all, I got directed to th

"Hey all, I got directed to this site from classicmako.com to get some help with a Johnson outboard issue. I have an old-but-still-working Johnson 115. I am starting to get an over-voltage alarm from my electronics; it is running about 16.0 V once the battery is charged. I thought, no big deal, just need to replace the regulator, but I have since discovered there is no regulator. Can someone tell me how the voltage was regulated on those old models and what I can do to fix it?


Second question is: the motor is new to me. I ran a Seafoam decarb and then checked the compression. I got 122, 135, 135, and 148. The 148 seems way too high. Is that something I should be concerned about?"
 
"okay, I did a search and disc

"okay, I did a search and discovered that the 16.0V is not unusual if you have a high end, sealed battery, and some people have been able to resolve the problem by changing batteries. (This is for the old, unregulated engines.) The thing is, mine is not a high end battery, just a basic marine deep cycle. Should I run the engine onto a plain starting battery and will this potentially fix the problem?"
 
tim...this is a copy of a prob

tim...this is a copy of a problem that i experienced a year ago or so..read it and you will have a better unbderstanding of whats going on with your motor..Carl
 
"So has the battery swap conti

"So has the battery swap continued to solve the problem over the last year?

I was planning on putting a second battery into the boat for the trolling motor, I guess I will need the second to be a cheapy instead of a good one. Then I can replace the current decent battery with a really good deep cycle after it fails.

Thanks for the help."
 
Tim...a cheaper battery will m

Tim...a cheaper battery will make the problem more intermittent but will not solve the problem in my opinion..the only fix would be to replace the rectifier with a regulator..i am at my camp and plan to be here for at least another week.maybe someone can jump in and get you a part number..i read this board daily and i probably have saw this problem pop up 25 times in past year on these non regulated OMC charging systems..
 
"Carl, thanks for the help. S

"Carl, thanks for the help. So is it a problem, i.e. is something working out of spec, or is it a design that is simply no longer compatible with modern electronic systems? Did you replace with a regulator and successfully eliminate the problem, or are you still using the battery swap to fix it?"
 
I think its a cost reduction p

I think its a cost reduction problem..i still running the battery swap..when this rectifier goes(which it will) then i am going to buy regulator..
 
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