Question about 1998 Mercury Grand Marquis

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1998 mercury grand marquis headlights

Head lights turn off suddenly by themselves , flickering ..

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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

Posted on Jun 12, 2014

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Posted on Jan 02, 2017

  • 82 Answers

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.

Posted on May 12, 2009

co7196
  • 3433 Answers

SOURCE: headlights work but dash lights and parking lights are dead

dash and tail sre tied together, so chk tail light fuse.

Posted on May 13, 2009

  • 1 Answer

SOURCE: headlights constantly go on and off, all other

i had this problem on my 2004 and it was the headlight module when it gets hot it turns out, and comes back on when it cools off

Posted on Aug 11, 2009

  • 7353 Answers

SOURCE: location of headlight relay on 1993 mercury grand

that is caused by a "circuit breaker" not a relay. when it starts flashing, carefully go over the harness from the firewall to the rf headlamp, there is a short somewhere.

Posted on Oct 15, 2009

  • 2 Answers

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.

Posted on Dec 31, 2009

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1 Answer

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1 Answer

1993 grand marquis while driving the head lights goes off and on


check your connections at the headlights especially if they are sealed beams with the three way connecter sometimes they will get corrosion, or dirt and not get the propper contact vibrations from driving will cause them to lose contact.

next check your headlight relay it could be going bad and not pulling the internal switchinside of it to close.

hope this helps.

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1 Answer

96 grand marquis


The headlamp switch is bad.

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