SOURCE: interior light and diagnostic plug doesn't work
The data link gets it's power from fuse no. 3(20 amp) in the interior fuse panel,which also is the power for cig. lighter. This fuse gets it's power from fuse no. 103 in the battery junction box (50 amp).
For the interior lights the door adjar switches in the door send a signal to the GEM module.It then grounds the coil side of the interior lamp relay. The switch on the dash that you turn on manually also grounds the coil side of the interior lamp relay so that would mean that everyrhing after the GEM is ok.Are the lights not turning on from any door including the deck lid? If not then problem would have to be in the GEM module.
SOURCE: Interior Light sometimes will not shut off in Ford Ranger Pick up
If I am not mistaken, the plunger is located in the door with the latch. Most of the time you can just pull the door panel off and adjust the switch. After opening and closing the door, they get knocked out of adjustment. I sincerely hope that this helped you. Take care and best wishes.
Bryon
SOURCE: 1989 F-250 Headlights wont come on
pull the headlight switch out and check for a burnt connector, if the connector is heat damaged replace it and the headlight switch, the repair connectors are avail from your local dealer.
SOURCE: Headlights
there is actually a modual that runs the lights... the lighting control modual (LCM) not saying this is for sure, but a good place to start. keep in mind if u replace the modual, you have to have it flashed(programmed) to the vehicle.hope this helps and good luck
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