Question about 1998 Cadillac DeVille

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1998 deville dash says trunk open, does this cause battery to drain overnight?

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If the trunk is 'open' ... there is probably a light in the trunk and the light will kill the battery over night ... yes. Adjust the switch to fix this problem.

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Posted on Sep 29, 2010

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Posted on Jan 02, 2017

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Why does my 1998 lincoln continental drain the battery, have flickering dash lights, fluctuating power steering assist, and disabled air shock pump continues to run even with switch in trunk off?


Battery drain caused by a short to ground (frame or body) somewhere. Most likely this short is intermittent, which makes the dash lights flicker, similarly the power steering assist. Most likely the trunk switch issue is the "short to ground" . Visually inspect carefully all wiring in near and by the switch, and Air Shock Pump. I like the new very bright Led flashlights for this kind of thing. You may also discover the short by observing the trunk electrical in the dark while the engine is running thus viabration causing the intermittent behavior. You may see flashes from the short (if you are lucky) Otherwise it will take a lot more inspection and checking. Good luck, hope it is the easier to find in the trunk.

Mar 12, 2015 | 1998 Lincoln Continental

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Something is draining my battery on my 1998 Cadillac DeVille


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.

Oct 23, 2012 | 1998 Cadillac DeVille

1 Answer

1997 deville, battery drains overnight,pin pointed to a relay in trunk energized, removed relay, no dash lights.if you remove body 3 50 amp fuse it doesn't drain overnight, but also won't start...


I've replaced several rear body control modules that go bad and drain the battery. It is located behind the seat, black box about 4" x 5" rectangle. You can use a hand held scanner to diagnose them, the ones I replaced did throw a code. It is complicated and you need a pinout chart to diagnose it with an ohm meter. The ones I got were new and ran around $350.00

Jun 09, 2011 | 1997 Cadillac DeVille

1 Answer

Battery drains overnight.


Alternator. The regular inside the alternator has an open diode. Disconnect the battery overnight and it will start the next morning. The alternator will need to be replaced to fix the problem.

Dec 22, 2009 | Cadillac Fleetwood Cars & Trucks

1 Answer

97 cadilac devile drains battery overnight


possibly alternator could be draining it ,or glove box light or visor light staying on causing it to drain out

May 11, 2009 | 1997 Cadillac DeVille

1 Answer

98 cadillac deville battery wont hold a charge


sounds like a 12V drain on the system, like a trunk or glove box light that won't shut off.> Could be many. many other reasons why. The way I would find the draining circuit would be to remove the neg cable of the battery. I then would connect a 12V test light between the neg battery TERMINAL and the neg battery CABLE. With a 12V drain the light will shine. I would install into the light a 9V battery powered recepticle to hold computer and radio station memory. Then I remove fuses 1 at a time, then reinstall, at the same time looking for the 12V light to go out. Hope this helps.

Apr 05, 2009 | 1998 Cadillac DeVille

1 Answer

When battery is connected fuel door and trunk open


well for starters there is many factors at play here. 1. battery chargers need to be on and battery disconnected. make sure if it has a timer it did not run out and (the charger may also have an internal fues/ relay ) if it gets too hot it shut off. Was the charger on a high enough setting to compenstate for the drain and is your battery good enough to be charged even. constantly drained batteries will actully not hold a charge after awhile. most parts or even walmart can check batteries free>
The trunk lights and fuel door on the same fuse? otherwise I would say the trunk has a bad switch that is not making contact or is making poor contact and acting as the trunk is open. it may just be pinched wires that rubbed together make contact with your cars steel body. They may be seen in the trunk follow the wires from the release switch and see if it connects anyplace near the fuel door. I am sure it will.

Mar 25, 2009 | 1999 Cadillac DeVille

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