I would replace the clock spring rotating contact drum under the steering wheel for the restraint system warning light issues and check the operation of the headlight sensor when the lights will not go off, this is likely a sticking relay.
SOURCE: 1994 Mercury Grand Marquis Check Engine Light Code 332
its the tube going from the egr valve to your exhaust it have carbon build up and you either have to replace it or get a metal coat hanger and clean it out.
SOURCE: I have a 93 Mercury Grand Marquis and the
There are 3 components for the headlights in your dash. The headlight switch, the delay switch, and the autolamp light sensor. If you have the lights manually turned on, without the autolamp position on the switch being on, then the headlight switch is a simple off-on switch.
If the headlight switch is manually on and the lights are cutting out the problem is either the fusible links or bad contacts in the light switch.
If you are using the autolamp position on the light switch, this is a different circuit. The autolamp system needs the light sensor to work. If the light sensor is dangling under the tiny slots in the dash every bump you hit will shake it. Or it can be a broken filament in the light sensor. To test, just eliminate the circuit by using only the manual off-on side of your light switch.
A loose power wire to the light switch (or ground) will affect BOTH the manual and automatic settings. But if the manual setting always works, then its the automatic parts that are broken. The delay switch does not work until after the ignition is off so it can not be the problem while you are driving.
Testimonial: "Hi- I had already eliminated the light sensor as a step and it was helpful to know that I should have done that. Thanks, Jim"
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.
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