headlights
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
F29 is a 5A fuse in the fuse panel under the dash. It supplies power to the autolamp sensor, transmission control switch, central security module, and belt minder module. The autolamp sensor monitors ambient light to control autolamp relays. As the light level decreases, sensor resistance increases to preset amount energizing relays, turning on headlamps and intrument illumination lamps. The sensor controls the headlamp relay which is in the auxillary relay box 3. Good luck! 
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Originally Posted by DaBossF250
My truck does the same thing, so If i take out that fuse, I can do it manually, and it will stop doing it automatically?
What do you mean by your question? Does your truck have adjustable sensitivity for the AL? Mine is not adjustable, just a position of the headlight switch. If I turn the switch to headlights on, then AL is off.
Senior User
Joined: Oct 2007
Posts: 180
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Originally Posted by KingRanchMan02
Taking out the fuse will shut down more than the AL sensor. I listed all circuits supplied by F29.
What do you mean by your question? Does your truck have adjustable sensitivity for the AL? Mine is not adjustable, just a position of the headlight switch. If I turn the switch to headlights on, then AL is off.
What do you mean by your question? Does your truck have adjustable sensitivity for the AL? Mine is not adjustable, just a position of the headlight switch. If I turn the switch to headlights on, then AL is off.
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New User
Joined: Jan 2005
Posts: 5
Likes: 0
From: san diego ca
auto headlamps
the truck has just the auto position off,park,and on. everything els on that fuse seems to work.
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Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
4xnut, do you have any problems with the other circuits that are supplied by F29? If not, then I would suspect a problem with the AL sensor. The AL sensor is up on top of the dash near the windshield. There is a light green/yellow stripe wire that goes to the relay that turns on the headlamps. To test the relay, simply use a jumper wire to ground this wire. If the headlamps illuminate with this wire grounded, then the relay is good and the AL sensor is bad. Good luck!
Last edited by KingRanchMan02; Nov 16, 2007 at 10:16 AM.
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