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check your fuses
headlight relay location on a 2004 mercury grand marquis
it's your headlight switch
Why ? Just replace it.
It's located on the steering column 2 screws unplug the harnest
it is on the firewall and difficult but not impossible to get to and replace.
How do you replace the timing chain on a 1994 mercury grand marquis
Bad door switch or bad headlight switch
how do i replace a passenger side headlamp for a 2004 grand marquis gs
on a 1997 Mercury Grand Marquis kill switch be activated by a rear end collision
how do you replace the front sway bar likn in a 1999 Grand Marquis?
how to replace starter on 2000 mercury grand marquis