Hi:
Yes, have the battery tested. First remove it from the car and fully charge it. Then, take it to a parts store and have it load tested.
If it's good, It sounds like you may have a ground problem. Make sure the inside of the terminals are clean as well as the battery terminals. When you replace them, make sure they are tight. Next, check the ground wire where it attaches to the engine and the body. Make sure the connections are clean and tight.
Let me know if this helps.
Joe
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Monday, November 3rd, 2008 AT 8:20 PM