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Why ? Just replace it.
Fuse, loose connection, or the light switch. how do you remove the dashboard on a 94 mercury grand marque?
The repair section on autozone.com explains how to change the light switch.
On a 1997 Mercury Grand marquis : The fuel pump inertia switch ( shut off switch ) is in the trunk , behind the trunk liner on the drivers side of the trunk , near the drivers side rear tail light ( there is an access hole )
check your brake lights if they not worhing replace fuse or brake light switch
I have a 1998 ford grand Marquis- and the problem is the air suspension light stays on- how to fix this problem
Have the codes read.
On a 1996 Mercury Grand Marquis : The fuel pump shut off switch ( inertia switch ) is in the trunk , behind the trunk liner on the drivers side of the trunk , near the drivers side rear tail light ( there is an access hole )
On a 2004 Mercury Grand Marquis : The fuel pump shut off switch ( inertia switch ) which has a reset button on top is located : ( in the trunk , behind the trunk liner on the drivers side , near the drivers side rear tail light , there is an access hole )
You won't know until you get the code read.
The brake light switch is under the dash hooked to the brake pedal at about midway up. It is a little switch that is like a push button that goes "CLICK" when activated, sending a pulse to the lights telling them when to turn on and off.
where dose daytime running lamp module go on92 mercury grand marquis need to replace one