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Old 09-19-2010, 07:58 PM
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Default How high is too high?

Outboard voltage, that is. At what number should I be concerned? I saw a 15+ at one point but it seemed to be momentary (don't know how long it was that high before I saw it) and seems to have settled down with no problems. Maybe 10 or more hours since then. Thanks
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Old 09-19-2010, 08:04 PM
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Low to mid 14 is average for motors at cruise. If u see too much higher for any length of time u might be having an issue with the voltage regulator. But sounds like it could have just been a misread on the gauge.
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Old 09-20-2010, 03:42 AM
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Check it with a meter if you see it get high again. Your gauge may not be totally accurate.
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Old 09-20-2010, 03:56 AM
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Quote:
Originally Posted by granpafish View Post
Outboard voltage, that is. At what number should I be concerned? I saw a 15+ at one point but it seemed to be momentary (don't know how long it was that high before I saw it) and seems to have settled down with no problems. Maybe 10 or more hours since then. Thanks

wich engine?

15 can be normal for an old two stroke without voltage regulator...
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Old 09-20-2010, 07:13 AM
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Depends on the voltage regulator or lack of one as Divefreak says. I would say that a consistent reading of 14 or better means that your regulator is non existent or not functioning correctly. Voltages should go back down when the battery is nearing full charge.
One thing is certain, consistent high unregulated voltages will lead to the premature death of your batter(y)ies. I had a boat with an old two stroke and was lucky to get two seasons out of a battery.
It might be worth the $$ to upgrade your voltage regulator.
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Old 09-20-2010, 07:19 AM
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I had one on an optimax go up to 15-16 (Voltage regulator went out). The next time I tried to start the engine the starter spun so fast that it ground several teeth off itself and the flywheel. So I had to replace the bendix, alternator, and flywheel, when all I really needed was a Voltage regulator
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Old 09-20-2010, 08:26 AM
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On newer motors, Mercury at least, output voltage should not be higher than 14.6V, average when batteries are fully charged, probably 13.2
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Old 09-20-2010, 02:15 PM
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Twin Suszuki 4 strokes. My son had a regulator go out on a Yamaha 4 stroke and it ate the VHF. I have a suspicion that there may be an electrical leak (I'll be asking for help under a new thread) and am not a believer in coincidences. Connected?
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