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Discussion Starter · #1 ·
I have a '76 Johnson 115. Garmin depthfinder is indicating a charge of 16.6 to 16.9 volts at 4000+ rpm. This is an unregulated charging system with a rectifier only. Boat mech that I talked to said he's seen this before and there's nothing really to worry about as the amps aren't that high. Unfortunately, the depthfinder is warning me of high voltage and cutting itself off.

Any ideas are greatly appreciated.

Tight Lines.......Q
 

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Over charge

I had the very same thing happen on my 98 johnson 200. It turned out to be a bad battery isolator switch, check your battery connections. It took a while to locate as it wouldn't happen all the time
 

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Had the same problem. I bought one of the AGM batteries that are used for deer feeders and alarms and used it to run my depthfinder. A charge lasts 8-10 hours.
 

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Call Eletronic Supply in Texas City ,Texas and ask for chriss 409 945-4401. Tell him your problem . There's got to be a voltage regulator you can inatall and reslove your problem.

R.R...
 

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willing to help

Call your old buddy judweiser, offer to take him fishing, and buy his beer, and you know he would be willing to come over and watch you fix it!
 

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Are you guys nuts

You don't ever ignore an overcharging condition, especially on a boat. You get the battery hot enough, with enough pressure & KABOOM. You can figure the rest out !!!!!!
 

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Discussion Starter · #9 ·
Thanks

I'll respond in order:

Profish - The highest setting on the depthfdr is 16 volts. Anything over that and it cuts itself off. Easy to solve w/ seperate battery or installation of regulator in line.

Blackgar - (1st response) - very likely the problem. Haven't had time to check/tighten all connections but plan to before taking her out again.

Redfishr and Sandman - thanks...see above.

Jud's just plain crazy, and he knows he's buying the beer. LOL

Blackgar - (last post) - due to the fact that the amp output on an unregulated charging system is going to be 9 amps (at the most) there is no danger of damage to battery or general operating systems. I was able to speak with two boat mechs that said 16-19 volts are very common outputs on the older omc motors. However, the exploding battery concern was the first thing I thought of when this issue started as well.

Thanks again for all your help guys. Except you Jud!

Tight Lines...............Q
 

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Overcharge

An unregulated charging system is capable of putting out more than 9 amps I don't care if it's a boat,car or toilet pump, without checking it you would never know. A consistant output of nine amps on a fully charged battery will create excessive amounts of volitile gasses after a long run period, a properly regulated charging system will drop to less than one amp on a fully charged battery untill demand requires more. This is a dangerous situation in an enclosed area with fuel tanks close. You can doubt me if you want. I am an auto electronic specialist with decades of experiance
 
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