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Old 06-30-2008, 08:14 PM
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patbob patbob is offline
Its a Whatsit
Join Date: Oct 2006
Location: Portland, OR
Posts: 837
Also, have you checked the acid levels in the battery's cells? Should cover the plates and a bit more. Top off with distilled water.

Clean the mating surfaces of the battery terminals and inside of the battery cable clamps, reassemble.

If the battery won't hold a charge, have you checked for a current drain on it when the engine is off? Some things, like the power antenna, are prone to failure and can draw amps out of the battery constantly. Sometimes the alternator diodes go and leak, reducing the alt's effecitveness and becoming a current draw on the battery when then engine isn't running.

With the alt light behavior, I'd suspect the alt ground or engine ground.

Check the alternator belt tension. Also check all the connections to it -- look for loosness or corrosion, or just skip that and remove them all, clean the mating electrical surfaces until bright and shiney, and reassemble using dielectric grease.

Also, sometimes the voltage regulators brushes wear out and fail to make contact, but then the alt light usually behaves differently.
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