Check your dimmer switch if turned all the way up the light will stay on. If that's not it might want to check your door ajar switches. Might have one going bad.
Those door ajar switches are inside the door an the latch mechanism. You remove door panel to get to them. Common problem.
1999 Mercury Grand Marquis
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Maintenance & Repair
After shutting door, dome light won't turn off and stays on even. Manual says it might take 45 minutes to shut down if condensation has occurred. This morning the windows were wet from temperature...
2006 Mercury Grand Marquis LS Premium
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Maintenance & Repair
Interior dome light comes on and off while the car is off and all doors closed
2000 Mercury Grand Marquis
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Maintenance & Repair
The BRAKE light on my dash is red and wont turn off, it turned on a couple days ago. Brakes make a groaning sound when braking. My brake pads were replaced a couple months ago.
1989 Mercury Grand Marquis LS Sedan RWD
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Maintenance & Repair
THE FAN IS ON HIGH AND WON'T TURN OFF.
2009 Mercury Grand Marquis LS
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Maintenance & Repair
1999 Mercury Grand Marquis
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