Quote Originally Posted by NoGPBrad View Post
Hello everyone, my girlfriend drives a 2003 Grand Prix with the 3800 engine. I am posting because I am having problems diagnosing an issue with her ignition/charging system. I'll start by saying that I am by no means a certified mechanic but I would consider myself somewhat knowledgable with cars in general. Anyway, her car is dying at random. We will jump her car and everything will work as it should; no lights dimming and all the usual. But once she parks it and leaves it maybe overnight or more than say 4 hours it will be dead when we go back out. I myself have tested the battery and alternator and I have taken the car to auto zone to have them test it for a second opinion. The battery and alternator seem to be operating as they should. Something must be drawing from the battery elsewhere. Do you guys have any idea what it could be? Is this a common issue? And yes, all lights radio, accessories are shut off before turning the car off. Thanks.


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I had Autozone and O'rielly Auto both check the battery in my car, they both said it tested just fine, but any time the temp dropped below freezing the battery would die. I bought a new battery and the problem went away. I've also had them test other things that were "fine" but when replaced with new ones the problems went away.