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I just thought of a problem my brother had with his 03. His battery was going dead every day or so and they traced the drain to a bad instrument cluster. I would have the battery load tested at least a couple times. I have seen batteries pass and 10 minutes later the car won't start. After several tests the battery finally showed a full charge and as soon as I put a load on it fell flat on its face. New battery and problem solved. Make sure there is no corrosion under the plastic boot on the pos cable also. GM's with side terminals are notorious for having the battery leak where the bolt holds the cable and corrode the cable inside while looking fine from the outside. When this happens all sorts of problems can arrise, From drivability to lights etc...
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