Head light issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by B5love08, Mar 12, 2024.

  1. B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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    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.
     

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    Last edited: Mar 12, 2024
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  3. SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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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.
  4. B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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    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
     
  5. B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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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?
     
  6. B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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    all fixed, not sure how to delete thread
     
    SmallPackage Thanks this.
  7. Ridgeline

    Ridgeline Road Train Member

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    what did you do?
     
    JB7 Thanks this.
  8. SmallPackage

    SmallPackage Road Train Member

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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.
  9. B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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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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