Question about 1997 Cadillac DeVille

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Battery go dead after sitting for about 6 hours

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First unhook the battery cable and wait 6 hours. If the battery is still charged when you hook it back up then start pulling fuses or relays. That car has so much electrical stuff it will take awhile to pin it down. One thing could be the seatcontrol box under the seat. It controls seat heat, power seats, memory seat. Do the power door locks work ok? A bad switch can drain the battery. How about rear leveling system. Leaky air shocks can make the pump run while the car is sitting. If you can't figure it out get a battery disconnect.

Posted on Jul 03, 2009

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