Quote:
Originally Posted by liquiddog
Check and clean all ground connections. If necessary put a wire wheel on a drill to clean up the metal where the ground connections are at. Then at least you can rule that out.
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If there was a bad ground connection, the car wouldn't start. Since it does, we can say with certainty that both the battery and the block are adequately grounded through the body. The alternator itself is bolted directly to the block with multiple bearing surfaces, there is no separate ground connection for it. So the problem is either a bad alternator, alternator harness, or an open in the D+ circuit.