Went to to find my headlights on. Truck was off, light switch was off?

V10GUY

MEMBER
2002 FORD F-250
V12
4WD
AUTOMATIC
114,000 MILES

I came home yesterday after driving in the dark, turned headlights off went into the house. After a couple of hours I noticed lights shining thru my front door. Went to to find my headlights on. Truck was off, light switch was off. When I turn the light switch on the headlights seem to get brighter. High beams all work. Pulled every fuse associated with the headlamps and nothing. Some one told me it might be the DRL's but in the three years i've owned the truck not once have the headlights been on during the day. Any help would be great.

Tuesday, November 3rd, 2009 AT 11:15 AM

2 Replies

JDL

MECHANIC
16,098 POSTS

Welcome to the forum, was it high or low beams that were on? The truck has an auto lamp module that I think has shorted out here is a wiring diagrams for the headlight so you can see how the system works and I have included the auto lamp module so you can unplug it to see if this is the problem.

The autolamp system provides light-sensitive automatic on-off control of the exterior lamps normally controlled by the regular headlamp switch. The autolamp system keeps the lamps on for a preselected period of time (20 seconds) after the ignition switch is turned off. The preselected time lapse is not adjustable.

Check out the diagrams (Below). Please let us know what happens.

Images (Click to make bigger)

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Tuesday, November 3rd, 2009 AT 11:51 AM

V10GUY

MEMBER
2 POSTS

I believe it was low beams, I had to hunt around to find the AL unit but it was behind the center of the dash, all fixed now, thanks for your insight.

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Tuesday, November 3rd, 2009 AT 6:03 PM