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Usually means that headlights are loose (most obvious/cheapest fix) but could be intermittent short where headlight wire is shorting to chassis ground (Visual and multimeter to find short). It could also be telling you that the alternator maybe going bad.
There's a l.c.m located by the gas pedal, just above it over the plastic cover.when this happens, slightly tap the module. If light come on then you need a new l.c.m (lighting control module)...very common concern eith this vehicle, unfortunately not cheap
(1998 Gr. Marquis) I just found the culprit of my fuse #13 for the speedo, temp and votage gages. I had to remove the gear shifter cover which was not difficult also the metal brace across the bottom and the ignition key, but it was a tiny exposed burr in the overdrive shift button wire just at the end of the gear shift leaver. I elec. taped it up and now, no more blown fuse!
To remove first you want to remove the headlight door mounting screws and remove the headlight door. Then you want to remove the 4 retainer ring screws and remove the retainer ring from the headlight. Then you want to pull the headlight bulb forward and detach the wiring connector.
To install you first want to attach the wiring connector to the headlight bulb and place the bulb in position, locating the bulb glass tabs in the positioning slots. Then you will attach the bulb retainer ring to the assembly with the retainer ring screws. Then you will install the headlight door and secure with the screws. Then you will check the headlight bulb aim and adjust as necessary
ther is a plastic guard with 3 locking caps that need to be turned clockwise a quarter turn to remove. remove from the front. you will then have be able to see and have access to the lights and adjustment screws
That is a common problem for the Marquis/Crown Vics for the time period. Check the connector (Unplug it and look at it) to the LCM Lighting Control Module the black plastic box with slots cut in it and a white plug with wires in it. It is under the dash to the left of the brake pedal. Unplug it and then plug it in and see if that helps. Ford will want an arm and two legs for it. Check a junkyard or Ebay. Google it for a pic or go to this Ebay link to see the pic. http://www.aboutautomobile.com/Complaint/2005/Mercury/Grand+Marquis/Exterior+Lighting
Release the hood latch inside the Rodeo. Raise the hood and look down behind the headlights. The old bulb and assembly are held into the headlight from the back side of the the headlight. There is not a great deal of room to work behind the headlight because of the battery on the passenger's side and the air cleaner box on the driver's side.
Grip the large round plastic nut with your hands and give it a quarter turn counter-clockwise. Carefully remove the head light and plastic nut. Look for the release lever to depress and pull on the old bulb at the same time. It will unplug very much like your computer power cord. Be careful not to drop the plastic nut.
Now plug in the new bulb and replace the plastic nut. Carefully insert the bulb into the headlight and give the plastic nut a clockwise quarter turn and try the new light.
I just replaced both of my headlights last night and I am an accountant.