intermittent headlights


Asked by Aug 05, 2009 at 09:17 AM about the 2004 Mercury Grand Marquis GS

Question type: Maintenance & Repair

Headlights just started to go out then come back on, parking lights not affected. Where should I start to track this problem down?

7 Answers


I would make sure the headlight harnesses are plugged in tightly. If they are, then there is probably a short somewhere between the headlights and the battery and you will have to trace the circuit until you find the short.

5 out of 5 people think this is helpful.

thanks Jonathan, just got back to this site as you can see I posted the same Q again.

2 out of 2 people think this is helpful.

change the switch in the dash

4 out of 4 people think this is helpful.

I just had that problem and replaced the light control module which solved the problem. Mine is a 2004 model also. Question for you: When you open the driver's door to get in, do you have a chime going off? After replacing the light module, Mine chimes when I open the driver's door even though no key is in the ignition. Open any other door and it doesn't chime. VisualTracker

8 out of 8 people think this is helpful.

What was the cost of the LCM and labor charges? Have you had the problem since? Thanks, ron

8 out of 8 people think this is helpful.

Cost was $500, most of which was a new LCM. No problem since. I searched online and found a refurbished module much cheaper (Appr $200), but with no lights, chose to have a new/readily available module installed.

2 out of 2 people think this is helpful.

The rebuilt ones work fine.

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