Having problems with your 1996 Cadillac DeVille ?

Cadillac battery drains over night

\015 96 deville, battery drains to 10 v after 12 hours, overnight will kill it to the point the cells are dead. had the battery tested with a meter , it ran 0 so i was told there was no drain. pulled the stereo deck out, unplugged the lights in the doors, checked if the light were on under the trunk and hood. I can't figure out what the problem is, please help. [email protected]\015 Posted / edited by AnonymousUser on : 19-03-2018

Answers :

Go to an Autozone,Advance, or Oreilys for a free charging system test. Have them check the Diodes in the Alternator.

Check the battery case by using a Voltmeter with one terminal on the plus post and the other on the sides of the battery case.

What sometimes happens is the Relays stick and do not turn off. When the Keyswitch is turned off, the Relays stay connected. This is hard to find because the Relays still keep the systems working.

There are 2 other ways to find the problem. In trying to do it yourself, you can work through the circuits by disconnecting the battery and bridging the 2 battery cables with an Ohmmeter. There are only a few things that always remain connected. Like the clock, computer memory, and alarm system.

When the fuses for these items are pulled you should lose the continuity or loop for the connections. Whatever is keeping the Ohmmeter active is the shorted circuit. This requires leaving fuses out of the powerblock as you keep pulling fuses until it breaks the Ohmmeter connection.

Another method is a Dealer wiring link. Wiring on your car is done section by section. The Dealer wiring link connects in between these sections and since the plugs match the factory connection pins, the Dealer machine can identify the individual pin connector that is grounding out. Or it can identify the switch or window or seat motor that is shorted.

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Unhook neg batt cable install test light between cable end and batt terminal if light is on you have batt drain pull fuses untill light goes out thats the circut thats pulling down your batt remember where each fuse goes also clock and raido fuse should be pulled first
Repair Help & Product Troubleshooting for 1996 Cadillac DeVille

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