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Q:

Battery is good, alternater good, but battery keeps draining on 1997 Cadillac DeVille

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What could be the problem when something keeps pulling the battery down? Usually the car radio & cd player won't work..then the car goes dead after a few days.
(1) Answer
There is something that is draining the vehicle that stays on when the key is turned off. The system should not have more than a 50MA (milliamp) drain on the system. To find the root cause a ammeter will have to be hooked up and fuses pulled until the drain goes away, then each branch of the circuit disconnected until the source of the drain is found.