Question about 2003 Mercury Grand Marquis

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My headlights arent turning on, but all other lights work fine. They do turn on from time to time, but not to often. The sensor nor the manual switch will get them to turn on when i need it.

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  • Mercury Master
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Check relay in fuse box under hood.

Posted on Sep 03, 2010

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Fix wonky, flickering, non working headlights


Replace the turn signal switch. All the exterior lights except the high mount brake light run thru it.

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1998 Lumina lights don't work at night!The lights work during the day but not at night. Does anyone know how to fix it?


Theres a sensor in the middle of the dash by the front windshield that detects sunlight and triggers the automatic headlights. The main headlights and daytime running lights might be on a different circuit, in which case they daytime running lamps would turn off at night and the main headlights would turn on, indicating the main headlights arent working and the daytime running lamps are working as intended.

I would check all the fuses related to headlights, check the bulbs and check the switch, then last the light sensor on the dash.

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Dash lights arent coming on when switching head lights on, all fuses are fine.


Make sure your dimmer switch is turned all the way up. If it is turned up and still no light then replace your dimmer switch and/or headlight switch

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1999 Silverado 1500 Headlights will not turn off


the head light switch is faulty witch causes an open cicket then the light's won't go out

Jun 04, 2010 | 1999 Chevrolet Silverado 1500

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I have a 93 Mercury Grand Marquis and the headlights randomly turn off and on, does anyone know how to solve this?


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.

Dec 27, 2009 | 1993 Mercury Grand Marquis

1 Answer

What started this mess? tailights, fog lights, brake lights....


The relay has nothing to do with the tail lights, but replacing the switch sounds like a good idea. There's a nut holding it in place, see http://www.skandix.de/en/spare-parts/electrics/switches/switch-headlight/1027524/ to get an idea of the construction. And the price. This is not worth fiddling about unreliable workarounds...
In addition, if fuses 15 and/or 16 burn frequently there might be a problem with the tail light cabling.

Good luck
Ingo

Feb 28, 2017 | 1987 Volvo 240

1 Answer

Headlights dont work


sounds like the contacts in the headlight switch have gone bad.. the switch needs to be replaced - I have seen this more than once...usually due to someone installing "high performance" headlight bulbs that pull additional current causing the light switch to "fry" over time.
first do yourself a favor, and test the bulb from one headlight, just to make sure the bulbs arent both burned out.

Dec 19, 2008 | 1999 Dodge Durango

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