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Cruising on my twin 89 200s I get 15.7-15.9 volts on digital gauge. Never gone over 16 but seems high. Is that too much? Been this way for as long as I can remember.......
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Verify voltage with a hand held meter. You might have a gauge that is not calibrated correctly. Don't hold me to this but I believe there may be dip switches on the back that need to be set correctly. Someone else may be able to verify. -
Check at the battery and at the back of the meter on the boat with a good voltmeter and see if the one one the boat is reading correct. Automotive alternators are usually regulated around 14.5 V but I have never put a meter on a large outboard. 15.7 V sounds kind of high to me.Comment
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I've checked with handheld digital and also the dash analog gauges for each motor are reading the same almost touching 16.
I'm thinking I'd better check the water in the 4 batteries.
I'm wondering if the 4 battery setup may be causing the overcharging??Comment
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