Question about 2000 Cadillac DeVille

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Electrical problem with 2000 Cadillac DeVille.

I'm driving Cadillac with 135 K miles. Last year I ran in the problem with draining battery. After testing on dealership my alternator and battery were replaced. Because I’m driving this car everyday I did not catch this issue but when my car was in garage for one day (24 hours) battery was almost dead and car would not start and even crank the engine. I put charger on it and after that it was ok. But my car would not start after sitting for around 12 hours. I’m coming to work at 6 AM and when I’m leaving at 6 PM, battery almost dead. Charging system is working good and board computer showing 14.5 – 14.8 W. I bought this car used and it was aftermarket radio in it. After mechanics suggestions I just removed it from the car but it did not help. What it could be?
Second issue is my fuel gage. When I start my car in the morning it showing right level of fuel but when I start driving gage is going creasy and showing almost full tank. Looks like first half of tank it showing right level but when it’s going below mid of the tank it showing opposite level and up to full tank mark. I’m watching my fuel by millage but it’s real pain in the back.
And third problem is SECURITY light. Sometimes after I start my car light is staying on. After I restart my car light is going away. It does not happened to often but it does.
I spend time and money on dealership diagnostics but no results.
If somebody has any idea or suggestion pleases response.

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  • vlkovalenko Feb 09, 2009

    When negative site was disconnected and I was trying to touch battery with wire it sparking and I can hear some clicking sound from left rear fendor of the car in the fuel cap area. Spark is pretty strong.

  • Anonymous Mar 22, 2009

    i have a 2000 cadillac deville. my battery would drain.so i replaced it with a new one and changed the alternator and relays.but now when i turn the key the car wont start as if it has low power.

  • Anonymous Apr 24, 2009

    My friend has the same problem. And when he disconnect the negative battery cable and lightly touches it to the negative battery post, there is a tiny spark

  • yadayada
    yadayada May 11, 2010

    when u disconnect the negative batt cable and lightly touch it to the neg batt post do u see a tiny spark?

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IT SEEMS SMETHINGS IS DRAINING THE BATTERY,MAKE SURE YOU DO NO LEAE THE KEY IN IGNITION BECAUSE IT HAS PAT KEY IT WILL DRAIN,BEST WAY TO FIND THE DRAIN,DISCOUNNECT ONE OF THE BATERY CABLE,PLACE AN AMMETER IN SERIES,WATCH THE READING,PULL EACH FUESE OUT FROM FUSE BOX (ONE IS LOCATED UNDER HOOD DRIVER SIDE,ONE UNDER REAR SEAT) WICHEVER FUSE THAT REMOVED AND CAUSE AMMETER DROP TO ZERO THE CIRCUIT THAT IS FED FRM FUSE IS THE PROBLEM ( MAY BE A GLOVE OR TRUNK LIGHT THAT STAYS ON OR OHER STUFF LIKE THAT)

Posted on Dec 27, 2009

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