Question about 1997 Cadillac DeVille

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Electrical My '97 Cadillac is giving some Elec. Problems. My Bright headlights won't work.. The gas gage Reads wrong, and fluctuates. Heater and air conditioning working funny. Left front door window glass not working (New Motor) Interior lights not working. Is this the fuses??? Engine Control Module?? Had to replace the battery. Still did not fix. Whats wrong????? jcarlson05@comcast.net

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I would check the fuses and relays along with the ground wires. Something as minor as a ground wire can throw everying into havoc so i would start there and work you way up to the ECM.

Posted on Dec 08, 2008

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You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
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2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

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