actually a batt. runs at about 12vdc...the charging circuit has to run at about 14.5 vdc to charge the deep cycle type batt's......so..if your gauge is registering anything above 12vdc..that should mean it's charging the batt....
now if your idling at say 600rpm...and the volt meter is reading 12vdc...then your ok...if your registering less than 12vdc..your alt. is not putting out enough pwr to run the engine and anything else...if your registering over 15 vdc..then (to be sure use a digital vo meter)..then the regulator is failing ....
a few things can affect the the output of the alt...fan belt loose...brushes in the alt. are worn out....rectifier circuit is faulty..which are the diodes....ie regulater....
SP
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2008 Bayliner 340 - "Wild Whim"
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