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ertech ertech is offline
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Join Date: Jun 2009
Posts: 697
alternator expert need help

Hi guys .
my car a a 89 Had my tach go wild once in a while but never has anything to measure voltage when that happens.Had my voltmeter in the car and this time was able to measure the voltage . it was at 11.4 and no mater how much I reved the voltage would not go past 11.7. it I turn off the car and let it cool .when I start again get 13 while running at any RPM.
1-why would My alternator light not come on when this happens?
2-I can change the voltage regulator easily but what if it a diode problem what do I do?and is there a way to check this?

Old 09-25-2010, 11:31 AM
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