Question about 2000 Mercury Grand Marquis

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2000 Mercury Grand Marquis Dome light stays on even with doors closed?

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2000 mgm ...dome light has always been an issue with draining the battery and causing issues elsewhere....Out of pocket with dealer over $2000.00 wanted to change LCM another $600.00 (I replaced from ebay $78.00 but wasn't the problem... I always thought it was the keyless entry pad. I disconnected the plug (took of the door panel and unplugged the large green plug...problem went away. Should have done this in 1997... now its 2012 and just fixed it...took 5 yrs to figure out....screw the dealer...they just keep replacing not fixing....My alternator was being wacked by the low battery reading every morning that caused other issues because the sensor are all so sensative...can't use after market parts on this car...the range is too wide and the computer does crasy things when out of range....I love the Grand Marquis 4.7...just love it and it runs great except for electrical issue which I hope I resolved. JUST UNPLUG THE KEYLESS ENTRY PAD and forget about it.

Posted on Jul 28, 2012

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You need to check the door push buttons located in the door jams unscrew them one at a time and unplug the wire till the light goes out start with the driver door thats usually the first one to go hope this helps

Posted on Jul 31, 2010

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1 Answer

2000 Mercury Grand Marquis Battery drains overnight.


I bet your dome light is coming on after you close the door. Keep doing what you are, or prepare to dig deep.

Sep 15, 2012 | 1992 Mercury Grand Marquis

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Your dome light may be staying on. Manually turn it off for a night, see if that helps. You definately have a slow draw somewhere.

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97 mercury grand marquis dome light turns on and off as u open and close rf door..any ideas???


Sounds like there is a loose ground wire inside the door panel, but the doorjam switch should be what determines the off and on. It is located in the doorjam.

Sometimes the wiring that goes through the doorjam can hide a broken wire inside. There are more connections in the drivers door because it is the Master location for all the other locks and windows.

Go to Autozone.com for wiring diagrams for free. Just register your car and you can get chassis diagrams to show where the wires are for that circuit.

If you are going to fool around with the wiring, disconect the battery first. The only big thing is the controls for the outside mirror can make the removal of the door a little more difficult.

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I HAVE A 1994 GRAND MARQUIS AND THE INTERIOR DOME LIGHT STAYS ON WHEN ALL DOORS ARE CLOSED.... I JUST WANT TO KNOW WHICH FUSE DO I NEED TO PULL SO I CAN TURN THEM LIGHTS OFF... UNTIL THE BIG PROBLEM IS...


the fuse will say ctsy lamp, however your problem is a door switch that is either stuck or shorted out, ( the little plunger in each door,, check all of those to see if they are shorted,, you can remove them,, use a meter to check them with it set on continuity , put a test lead on each end,, and ground to the case , with the plunger out, you should get continuity , with it in you should get none

Sep 03, 2011 | 1994 Mercury Grand Marquis

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Door light switch not turning off or out of adjustment.Go to each door and
remove switch on the frontof door pilar post and unplug switch. Do that to each door to see which switch makes the lights go out

Feb 21, 2011 | 2003 Mercury Grand Marquis

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THERE IS A CONTROLL BOX INSIDE THE DRIVERS DOOR THAT WORKS THESE LIGHTS. TRY TO GET ONE FROM YOUR LOCAL JUNK YARD BECAUSE FORD WANTS OVER $450.00 FOR IT.

Jun 29, 2010 | 2000 Mercury Grand Marquis

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Dome and courtesy lights stay on after car is exited and locked.


INSIDE THE DRIVERS DOOR IS A CONTROLL BOX THAT WORKS THESE LIGHTS. TRY AND FIND ONE AT A LOCAL JUNK YARD BECAUSE FORD WANTS OVER $450.00 FOR IT.

Jun 11, 2010 | 2000 Mercury Grand Marquis

1 Answer

1998 Grand marquis


had same problem. the switch for the light is in the door handle mechinism. I sprayed all four door latchs with wd 40. turned out it was one of the back doors. hope this helps

Mar 25, 2009 | 1998 Mercury Grand Marquis

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Check the switch near to the door latch, check also wiring from door latch to fuse cable, there must be a contact between to wires.

Sep 11, 2008 | 2000 Mercury Grand Marquis

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