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Had to take boat off the water early today due my volt meter initially indicating 16 volts then crept up to 18 volts. Without eng running the digital multi-meter on the batts read 12.8 each individually. Started the engine on each batt individually and each batt read 13.7 with eng running. However, each eng run test the volt meter again indicates 18 volts and the tachometer is functioning following throttle input. Is there a better way to check the rectifier/regulator or isolation check for the volt meter?
2005 GS 202 '06 Yamaha 150
2005 Tennessee Tandem Trailer