Question about 1990 Pontiac Bonneville
I suspect your alternator is defective. Jump start the car and then with a volt meter (Multimeter) check the DC voltage at the battery with the engine running. You should have 13.5 ? 16 volts. Any less or any more and your alternator is defective. The fact that you can jump start the engine proves the starter is good. So we know it is either the battery, or alternator. You have replaced the battery so unless you got a defective new battery then the alternator is the problem. Your best bet would be to jump start the car and drive it to your nearest Auto Parts Store. Almost all of them will check your charging system for free and diagnose any problems. Advance, Auto Zone, for sure will check it for no charge.
Posted on Sep 27, 2010
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Posted on Jan 02, 2017
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