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Its a good possibility Your diodes are burnt out, its time to replace your alternator, i had a similar problem on a 95 lumina with a 3.1l motor

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โˆ™ 2006-04-18 03:18:57
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Q: What causes the battery and brake light to come on when the alternator connector is plug in and it will go out when it is disconnected and sometimes with it connected it will kill the battery?
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Related questions

Why would your Bonneville charge somedays and then not charge other days you replaced the alt and battery?

I have a 92 Pontiac and also had similar situation. Sometimes the voltmeter would go to 14volts and other times it would sit at 12volts. When I tested output from alternator to the battery with voltmeter, I did not get a good reading. Upon removal of the alternator to get it replaced, I noticed that the smaller (red) cable that goes from the alternator to the battery was loose in the connector itself. I cut the cable at the connector, stripped the cable some and crimped on a new connector. Reattached to alternator and put alternator back into vehicle. All has been fine since. Hope this may fix your problem.

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