Hi:
It could be the battery. Have it fully charged and talke it (still in the car) to a nationally recognized parts store and have them load test it. If it's weak, they'll know. However, I also recommend having the alt tested. It may have a bad diode that can kill the battery over night.
Let me know what you find.
Joe
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Tuesday, February 3rd, 2009 AT 7:49 PM