Question about 1990 Pontiac Bonneville

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My 1990 Pontiac Bonneville SSE won't start. The lights and radio turn on, but when I try to start it all I get is a bunch of clicks. I've checked the battery connection, which was good. I also tried boosting it which got it started but once I shut it off that was it, no matter how long I let it run for. I've replaced the battery but nothing changed, Is there anything else should I try?

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  • Brandice Hewitt Sep 27, 2010

    But the alternator was just totally replaced about 2 years ago........I will try the volt meter and see what happens with that, as well as talk to Auto Parts.


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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

  • NOT ME Sep 27, 2010

    I understand that the alternator is only 2 years old but it can still be defective. Also check the drive belt for the alternator to make sure it is not slipping. It can be that the voltage regulator is defective but on your car it is built into the alternator.


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