More then likely a problem with the shift interlock system . Stepping on the brake pedal , do the brake light's light up ? The shift interlock system is a safety system that won't allow the gear selector to be moved out of park unless driver is pushing the brake pedal . Part's involved - brake switch , inlock solenoid , wiring etc.... May also have electronic module involved , BCM - body control module .
Do you have floor or column shifter ?
Shift Interlock System
The shift interlock system consists of:
The shift lock mechanism locks the gearshift lever in PARK:
The shift lock actuator releases the gearshift lever:
SOURCE: 1988 mercury grand marquis will not shift out of
Shifting Linkage could be seized or out of alignment, A Chiltons Auto book would have a detailed instruction on how to check that. You can order and buy one at any Oreilly auto store
SOURCE: REPLQCE CIGARETTE LIGHTER IN 2005 MERCURY GRAND MARQUIS
Sorry sir are you asking how to replace or hace you replaced and still does not work but anyways have you checked both underhood and dash fuses yet I always check those it doesnt take much for those fuses to go bad in a cigarette lighter plug in
SOURCE: 2002 Mercury Grand Marquis will not shift out of Park
Check the limit switch on your brake pedal. Or step on your brake pedal.
But there would be a fuse for those lights, somewhere. The park/taillights and the license plate light would for sure be on the same fuse. Not sure about the shift indicator light, that might be on a separate fuse like for dash lights and/or instrument panel lights. But yes, you need to look at all your fuse panel sites again, there might be more than one under the dash, too, maybe behind the glove box or under the dash on the passenger side.
Check to see if your brake lights and rear turn signal lights work. Do they still work right? If they don't work either, there may be a ground problem with the rear lights. If still no help with the lights, one would need a voltmeter and a wiring diagram of the lights to track down the problem. Things like looking for power along the electrical path from the switch to the fuse panel to the lcm to the bulbs. First find the fuse. good luck.
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