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Why do interior lights come on in 1999 Mercury Grand Marquis when engine and headlights are off?
Wiki User
∙ 14y ago
you need to replace the the keypad on the door....the membrain has cracked and is letting moisture in.....if you leave the headlights on auto you will find they will go on and off too
Wiki User
∙ 14y ago
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Why do interior lights in 1999 Mercury Grand Marquis intermittently come on after engine and headlights are turned off causing battery failure?
Bad door switch or bad headlight switch
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how to changing engine coolant on a 1993 mercury grand marquis gs.
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2002 Mercury Grand Marquis engine light stays on?
Have the codes read.
