Thread: alternater
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Old 04-08-2016, 07:40 AM   #3
High Wire
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City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
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Using a digital voltmeter, does the battery voltage rise at all above the pre-start voltage?
-Check the wiring as Mike said above. If you have a ammeter on the dash, the power out of the alternator goes all the way up to the dash and back to the engine. Lots of opportunity for a bad connections.
-Check the belt tension and condition. Slipping belts won't drive the alt to charge more than a couple amps but the voltage will rise a few tenths.
-Sometimes the alt or the internal voltage regulator just goes bad. A stock alt is cheap and easy to replace.
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