Head lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by BRD TRANSPORT, Mar 8, 2024.

  1. BRD TRANSPORT

    BRD TRANSPORT Light Load Member

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    Jul 6, 2018
    0
    03 peterbilt 379 same dam thing .
    Replaced all 4 headlights
    2 low
    2 high.
    Replaced turn signal switch.
    Fuse is good
    Relay new
    Still no lights.
    Any idea would be helpful thanks much in advance.
     
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  3. FLHT

    FLHT Road Train Member

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    Got power where the wiring plugs under radiator ?
    Run a ground wire to headlights.
    Had same problem when I put new led headlights in a few years ago.
    Lost the ground
     
    Magoo1968 Thanks this.
  4. BRD TRANSPORT

    BRD TRANSPORT Light Load Member

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    Jul 6, 2018
    0
    Thanks for the info.
    Had already checked that and spliced a shaky wire.
    Looked behind dash at light toggle and saw it had melted alittle. Replaced it and put connectors on wires .
    Hard wire so to speak and bingo lights.
    Dam I was ready to throw in the towel and pay someone to fix it.
    I got lucky. ;) .
    Thanks for the tip just the same.
     
  5. FLHT

    FLHT Road Train Member

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    Might want to change that fuse. It should of tripped..

    It's always something.
     
    Magoo1968 Thanks this.
  6. Smellfunny

    Smellfunny Road Train Member

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    Did you go from Halogen to LED? Some require you wire the lights differently.
     
    Magoo1968 Thanks this.
  7. Magoo1968

    Magoo1968 Road Train Member

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    St Malo mb
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    At a former company a co worker ended up adding a marker light under the hood to provide a constant draw on the circuit. His new led headlights would flash otherwise due to the low power draw it messed with his headlight relays or ecm somehow.
     
    BoxCarKidd Thanks this.
  8. The one california kid

    The one california kid Medium Load Member

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    Oct 31, 2023
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    "Constant draw on the circuit" you do that to get around the speed limiter the company likes to punish you with. Shhhh, ancient Chinese secret.
     
  9. BRD TRANSPORT

    BRD TRANSPORT Light Load Member

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    Jul 6, 2018
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    No not a fan of led headlights
     
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