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Mine is a 2000 Escalade, purchased used just last year. I have been having sporatic problems with finding my battery low after not driving it for 3 days. That problem has become quite a bit worse. Now if I go a day without starting my car the battery is low and needs a boost to start. If I don't drive it for 2 days the battery needs charging to start. I have had the battery replaced and the alternator checked; both are okay. What is killing my battery. There was some talk that my factory installed alarm system was malfunctioning. I'm not sure if that has anything to do with it. Would appreciate any help in diagnosing this problem.

it could be your alarm system or any of the other  electrical systems on the truck have some one do an amp draw on your truck with the key in the off position then its just a matter of disconneting the systems one by one till you find whats drawing down your battery

Thanks a lot. In order to avoid getting ripped off, it's important to know what to tell the mechanic specifically you want done. I'll try this; it sounds less expensive than taking it to the dealer to be put on a diagnostic machine.