Question about 2008 Pontiac Grand Prix

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Volts on battery go up and down. Thought is was the alternator- replaced it. Still doing it! had alternator and battery checked...both are still good. 2008 grand prix

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  • Mike May 11, 2010

    This type of reality is REQUIRED, due to physics... What, exactly, are the conditions? I presume at idle, but what is running? What is your idle speed? Have there been ANY electircal events lately, like left lights on, or some other discharge? What are the voltage readings, across different conditions?

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  • Master
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A battery can be tested good and still be bad. The questions is is the battery holding a steady voltage with a meter hooked to the battery. If it is the problem is not your charging system and most likely not your battery. You should have 12 or better engine off and 13.8 or more engine running fairly steady. If it is I would suspect the gauge as being the issue or a loose connection going to it.

Posted on Sep 11, 2009

  • Ernset ( Skip ) Bouvette

    or better yet if this is really a 2008 then your under warrenty. Get it fixed at the dealer for free.

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  • Pontiac Master
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A poor engine ground can cause this problem, take the battery ground loose at the engine and clean it with a wire brush and reinstall, let me know if that helps, also check the alternator connector for overheating, have the battery tested for a failing cell

Posted on Sep 11, 2009

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