Question about 1998 Cadillac DeVille

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Something is draining my battery on my 1998 Cadillac DeVille

Something is draining the battery on my 1998 Cadillac DeVille. I have had the charging system checked and the battery,alternator, and starter are all good. Could it be that the positive batery cable corroided where it connects to the starter? I have changed the negative cable.Thanks.

Posted by R. Hernandez on

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  • daryl girnt Aug 14, 2013

    aquire a simple test light remove one of the battery cables connect one side to battery the other to cabellight willglow depending onseveraty of draw now remove one fuse at a time untill light goes out at this point you have located which ciecuit has draw

  • daniel gutierrez Sep 19, 2013

    its the alternator i had the same problem in my eldorado i got everything checked and the said it was good i bought one to see and it never drained anymore

  • thomas clayton Oct 23, 2013

    leaving keys in ignition on newer cars makes computors go into stand by causing a draw that will discharge battery in 2 to3 days



2 Answers

Braunson Y

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I suspect parasitic draw. All vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw.

It is always a very low draw so it doesn't run the battery down. If you install accessories like shortwave radios or plug things like inverters and portable refrigerators into the accessory socket and operate them too long without the engine running you can drain your batteries to the point where the engine won't start. If there is an electrical short in the vehicle or a malfunctioning accessory it could be drawing much more than its normal load causing a drain on the batteries. If you leave your door open and the inside lights stay on all night you could drain the battery down till the car won't start.

Here's also a good resource for your car specifically on narrowing down the cause of the drain.

Posted on Oct 23, 2012

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  • Emilio Ciampa
    Emilio Ciampa Aug 05, 2013

    I thought I was the only Technical Guy out here:)

  • Billy Jennings
    Billy Jennings Aug 09, 2013

    When my caddy was doing that it was the leveling system it runs weather the car is or not just go to the junkyard and get a little pump off one usually on the driver side under the hood undo 3 bolts she's off . It looks like a mini air compressor ...I dealt with that mystery for years bingo last thing I tried.

  • derek
    derek Sep 15, 2013

    My 97 Cadillac eldorado was doing that and it was the valet button in the glove box. The one that makes the key fob pop open your trunk and gas cap. I turned it off and all was good.

  • Stephen Potts Jan 22, 2014

    Check the acc wire going to the starter. Have you replaced the solenoid?



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I've a 1989 Cadi Deville got the same problem three times that drained my battery. Got Walmart checked the battery CCA all good. Tonight just found that was caused by the two radiator fans won't shut off.... keep running in low speed even engine is cold.

Posted on Oct 12, 2016


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Colin Stickland

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SOURCE: replace my alternator and charge battery to 93%

disconnect alternator and try it again

Posted on Dec 30, 2010


Ricky Peters

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SOURCE: I have a 1998 Cadillac

Sounds like a faulty voltage regulator to me.Start the car and take a multimeter and check voltage coming out of the alternator it should be 14-14.6 volts if its not within these specs take alternator back and get a new one.

Posted on May 15, 2011


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SOURCE: i got a brand new starter and batery on a 1998

If the security light is flashing you need a new ignition.

Posted on Mar 25, 2010

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Two batteries two alternator and still says service charging system battery not charging and as soon as battery is drained won't start Cadillac 1998 sts

Could be a wiring problem.
Have you checked the wire from the alternator to the battery or starter, and is the alternator being entergized by the key switch ?

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It is more likely that your alternator has failed. Have your alternator tested and replace as necessary.

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Battery drains when engine is running put new battery,alternater, negtive ground wire.please help

Check the cable from alternator to battery,and make sure there is no breaks, The charging system relies on the alternator voltage regulator,which is controlled by thhe PCMcansmo_203.gifcansmo_204.gifOn a very rare occasion its the PCM check the fuses

Sep 12, 2011 | 1998 Cadillac DeVille

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I have a 1998 Cadillac Deville. I replaced the battery, and alternator. Its still not charging properly. The service charging system light is on on the dash. Can you tell me what else could be wrong?

Sounds like a faulty voltage regulator to me.Start the car and take a multimeter and check voltage coming out of the alternator it should be 14-14.6 volts if its not within these specs take alternator back and get a new one.

May 15, 2011 | 1998 Cadillac DeVille

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My alternator is good & my battery still gets drained

How old is the battery? I learned at Sears while working there in the battery department that the average life of car batteries is about 3 years. So, after that, batteries lose a significant amount of their performance CCA or cold cranking amps, and may have to be replaced on a pro rated basis after that period of time, on average.

I put a diehard platinum battery into my 1997 Cadillac Deville Limousine for about $189.99 plus tax and it has a 4 year replacement warranty due to bettery construction.

However, if you get Walmart's best Maxx battery, they have a 3 year replacement policy and they charge about $79.99. I put that into my 1990 Cadillac Deville.

Good luck on resolving the battery drain problem with a good alternator.

Dec 18, 2010 | 1998 Cadillac DeVille

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Check charging system

So you have a new alternator. I S IT CHARGING ? If the answer is yes , and the battery still dies, I would say there is a 12 volt drain in the electrical system. Hope this helps

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Battery keeps dying in the middle of the night

have the alternator checked it could test good and still be bad but it can also drain the battery 9 times out of 10 its the alternator thats draining the battery

Feb 01, 2009 | 1998 Cadillac DeVille

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