Question about 1999 Pontiac Grand Am GT

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1992 grand am

Volt meter jumps from 13-15 volts. had the alt checkedputting out 15 volts constant. not sure where to look next.

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I recommend removing the alternator and taking it to Autozone. They can test it for volts, amps, and also check the field control circuits.

Hope this helps.

Posted on Jul 09, 2008

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Hi,
First thing to do is clean both battery connections.Fords are really bad for the battery connections corroding. When this happens you can get a good volt reading but not be getting enough amps. Next is to disconnect clean and reattach the electrical connections at the starter. Also check along the wires going from the battery to the starter to make sure the insulation has not been damaged. It is unlikely but possible that a critter or road debris damaged the insulation and caused one of the wires to corrode. The starter is the heaviest draw on the battery so physical damage to the electrical system will show up here first. If everything else checks out you will want to have the starter checked. If you are capable of removing it most major auto parts stores can bench test them.
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I am helping a friend fix up his 92 G20 5.7L Conversion Van and he has had the throttle body injectors/ bridge replaced with a used one. There has been a full tune-up performed, including coil. New vacuum...


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