Bad Battery or a short maybe? on 2001 Pontiac Bonneville

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My car started having trouble starting. The battery acted like it was dead, then everything would come on and the car would start for a few seconds, then die. It would finally start and stay running. The A/C kicks on automatically. Now my car won't strat without being jumped. The guages also worked intermittantly. The vehicle data will read, service theft sytem, check tire pressure, engine oil change soon, and chec kvolt meters. Does anybody have any idea what might be going on?
(1) Answer
(2) Comments
First answer is right. This car has two cables hooked to the pos. term.One on top of the other.
Have a lot of trouble here. Remove the neg. cable first,then the positive and clean all.Put the pos.
back on first.
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