There are two 15amp fuses marked 4 and 8 that provide power to the light control module. If those fuses are good, and those circuits have power, the problem may be with the control module. The module provides power to the dash lights.
You may need a shop to trace the circuits and find the problem.
SOURCE: headlights and interior dash lights flickering mercury marquis
while this occurs; do you hear clicking near your right foot area while sitting in the drivers seat? it may be heard very faint (you may have to remove the sound barrier panel under the dash first. Does this problem only happen with "Automatic" lights? Does it happen while in the parking lamps position? I wish to suggest the light switch itself, or the connector at that switch may be loose, or the negative supplying the switch could be loose. But more likely, you should check for a defective BCM, or loose connections to it, located between the lower left of the ash tray area and the accerator petal area (the relay inside on the circuit board may have a bad solder connection to it) ... or the relay inside is bad period.
SOURCE: 1993 MERCURY GRAND MARQUIS FUSE BOX LAYOUT
I can provide a fuse box diagram of a 96, it is the same, here is a link to that manual from a Ford site. U want to look at page 273
http://www.motorcraftservice.com/pubs/content/~WOTGRN/~MUS~LEN/41/96grnog1e.pdf
SOURCE: headlights work but dash lights and parking lights are dead
dash and tail sre tied together, so chk tail light fuse.
SOURCE: 2003 mercury grand marquis headlights will cut out
My 2003 Mercury Grand Marquis has the same problem. We found out it was the headlight module located under the dash above the gas pedal. The black box has wire connectors coming out of the back. Hitting the box worked for a little while, then I had to reach in the back and wiggle the wire harness. The dealership wants 500.00 to replace the unit. I consider Highway Robbery! They have installed a faulty piece of equipment on my Luxury car that could easily be life threatening but we know it won't be recalled until someone dies because of it. My husband was able to remove the unit and looked it over it had two circuit boards and he was unable to visibly see any problem or loose wire. He cleaned the connectors and used some electrical terminal grease on the wires, this improved it for a short time. The problem still exsists. I have sat for 30 minutes or more waiting for them to go through the On/Off cycle till they stay on for the 45 minute ride home from work. I have beat the box with my flashlight (maglights handle the abuse, my fingers and nails don't) till it came loose from the brackets that hold it. I leave my car running while pumping gas, short shopping trips and start it 20 or 30 minutes early before leaving for work. It is frustrating and dangerous. If this is the kind of quality in our American made cars it's no wonder they needed a BailOut! The only thing we have found to "fix" it is to find a used part that could possibly have the same problem shortly down the road or pay the theives at the dealership to replace it.
SOURCE: headlight assembly switch does not work properly
I would say try replacing headlight switch...I have the same problem and will be doing that tomorrow
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