Had to replace head lights in truck cause old led’s started to burn out and one had water in it. Anyway just hooked up new one and running lights in headlight works but not the low beams or high beams. Hooked up other headlight with same outcome to rule out faulty headlight. Any ideas? On a 1999 freightliner FL112. Only the top and bottoms two lights work as seen in picture.
Head light issue
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by B5love08, Mar 12, 2024.
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Attached Files:
Last edited: Mar 12, 2024
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Tried to put some of those 7” in an old chevy pick up. Frustrated us for half a day. Figured out they would not work thru the old dimmer switch.
Diesel Dave Thanks this. -
Truck already had a set of these in it. I replaced them with same exact ones. May hook up to my jump pack and see if I may have a broken wire somewhere
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Just hooked head lights up to battery and high beam and low beams work? So what we thinking a broken wire somewhere or?
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all fixed, not sure how to delete thread
SmallPackage Thanks this. -
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Don’t delete. Let us now what the mystery fix was so the next guy who has the problem can thank you for being his/her hero. Lol!lester Thanks this.
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not sure if I’m a hero but to start I unplugged the harness that comes out the cab basically and tested the end and there was power so the switch in dash worked. the harness between the 2 headlights was basically left. I found broken wire all through the harness and fixed it. Hooked all back up and only one head light worked. So went to other side that wasn’t working and found a wire connector in a plug had pushed out so pushed it back in plugged it in and success
Flat Earth Trucker Thanks this.
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