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Cadillac Repair/Cadillac deville battery drain


QUESTION: I recently pulled the fuses and found the issue to my battery draining was the 12 fuse the auto level control that is draining my battery.  I was wondering how to fix it? also are there any cheap and easy ways to fix it?


You did not state the year. Sounds like the air compressor may be running when it is not supposed to due to an air leak in the lines or the shocks.

Soap and water on the fittings and lines and shocks. Watch for bubbles. That is your leak.

Good luck!

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QUESTION: I'm sorry it's a 1990 Cadillac coupe deville.   Would a leak cause the battery to drain?


Under the hood on the driver's inner fender you will find the compressor. Disconnect the wiring connector. If car sagging in morning, plugging back in will bring the rear back up again.

Yes. Compressor would run to fill the suspension. I have run across it many times.
If not the problem, I would suggest you obtain a factory service manual for a 1990 Deville/Fleetwood from Ebay or Craigs. Best tool you can ever have and will constantly save you money. They are about $100.00. 8 pounds. Just looked one up for a 1992.
You can use the flow chart for diagnoses to see what all s on that circuit, so you can start disconnecting components til problem stops.

As I said, most common is compressor running battery down at night.

Good luck!

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Rob Painter


Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?


Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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