Chris-380
Well-Known Member
Keeping it simple. I can check the voltage with the shore power off on the batteries. Then start the engine, and I should see it increase about a volt, correct, if not alternator would be bad?
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Off shore power, I would see a drop in the voltage with out even starting the engines. With the engine started, it would not put out a charge at less that 2k rpm I think it was. A bad diode in the alternator will create a draw on your batteries in short order. On mine, I was at a raft up, generator/battery charger were on for over 4 hrs. Shut down, and an hour later, my batteries were dead and could not start the engine.