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What is the identification stamped at each lead on the rear of the alternator? Even French electronics have some identification on each lead, that would be a start. Also, what do you have them connected to, besides the tach?
Running 18VDC on a 12V nominal system for even a short length of time can cause a lot of damage very quickly, blowing out the electronics and every light bulb on the boat. You really, really, don't want to let it run that way.
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