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Old 08-16-2011, 03:03 PM   #2
AaronGTR
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AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 39
Posts: 12,197
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
How did you check the alternator? If you just took it out and had them test it at the store, it could still be bad. I did that once... they told me it was fine but it had a bad voltage regulator. Their machine can't simulate voltage load from running accessories, and if your voltage regulator on the alternator is bad, the voltage will keep dropping until the battery light comes on.

If you have access to a mutli-tester or volt meter of any kind, try hooking it up to a power and ground wire somewhere on the car. Then with the engine running, start turning things on... A/C, head lights, radio, etc. See what the voltage does. If it doesn't stay above 13 volts and starts dropping into the low 12's and 11's, then replace the alternator.
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