No power to marker light

Discussion in 'Experienced Truckers' Advice' started by D.Tibbitt, Jul 24, 2021.

  1. D.Tibbitt

    D.Tibbitt Road Train Member

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    The marker lights on my driver side headlight are not working...turn signals work but no marker lights... i have changed bulbs, didnt fix it .

    So i tested the connector - nothing. So i started back tracking on the wire to where it is spliced figuring thats where my problem is. Still no power.

    Back tracked and unplugged the entire headlight assembly connector where it plugs into the harness . Ive got power out of the harness for headlights, turn signals and 4 ways. But no marker lights.....

    Where do i go next ?
     
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  3. loudtom

    loudtom Road Train Member

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    Trace the harness to wherever it connects, like a fuse box or LCM. Keep tracing it back until you get voltage.

    In the meantime, you could run a wire from the passenger side marker to power the driver side if it's giving you that much trouble.
     
  4. Rideandrepair

    Rideandrepair Road Train Member

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    You’ve got a broken wire somewhere. Mr obvious strikes again!! Lol. They’re usually wired across from the other market light. I would check the wiring on the other side. Look for an extra wire going in, and across from the marker. You can always jump it with a piece of wire, maybe stick the end into the plug, and plug it in, for now, to avoid cutting wires unnecessarily, till you can replace or repair the harness properly.
     
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  5. Rideandrepair

    Rideandrepair Road Train Member

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    Beat me to it! Lol. I’ve had to jump different lights, till I could get a new harness. Recently fixed passengers side, by splicing a new wire. Harnesses have gotten expensive.
     
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  6. loudtom

    loudtom Road Train Member

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    Yeah, I actually bought the crimper and pins for the weather pack so I could repair one of my connectors, but still haven't got around to doing it. I actually feel like if I need to remove the headlight or hood, I'd rather cut the wire and heat shrink the new connection again.
     
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  7. Cattleman84

    Cattleman84 Road Train Member

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    Why the hell is everyone talking about replacing harnesses... Just find the #### broken wire, solder, heat shrink... Fixed. I dont think I have ever replaced a harness unless it caught fire. I've ran new wire right along the old when I had a bad/problematic section. Ive spliced, wires that originally had plugs. And I've added plugs for my own convenience where there originally was none. Ive spliced 2 harnesses together in order to replace a burned section, just took the needed section from a wrecked donor truck.

    Harnesses are expensive, and a pain in the ### to replace. Just find the bad spot and repair it... the right way, the first time!!!


    Materials needed:
    Solder
    Wire
    Heat Shrink (the good kind with glue on the inside)
    Wire Loom
    Electrical Tape (or Goriila Tape)
    Heat Gun (or blue flame lighter)
    Patience
    Time
    Test Light
    Multimeter

    Can buy all of that for same or less than a harness... And most of it will be used over and over again on other repairs and projects.
     
  8. D.Tibbitt

    D.Tibbitt Road Train Member

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    Update . I plugged in drivers side headlight assembly connector to passanger side harness and marker lights work. So i started unwinding the 500 miles of electrical tape at the harness and we have uncovered a hack repair job.... The 2 butt connectors that is the marker light wire..

    IMG_20210724_1810020.jpg
     
  9. D.Tibbitt

    D.Tibbitt Road Train Member

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    Update we have power to the marker lights just under the bottom butt connector... thanks for the help fellers
     
  10. Cattleman84

    Cattleman84 Road Train Member

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    Find a junker truck you can take that plug from for $10... Take about 12" of all the wires with it. Then do a proper soldered slice and heat shrink on the whole deal.
     
  11. AModelCat

    AModelCat Road Train Member

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    If I were to repair that, I would simply unpin that wire from the plug, crimp a new pin onto a length of new wire and solder it in to the main harness. Only 1 splice in 1 wire and you'll probably never have another issue with it.

    That plug looks like a Deutsch DT series plug. Should be able to get the female socket pins at just about any auto parts or industrial supply store. Budget crimp tool is pretty cheap. Just have to pull the green part out, pop the lock tang back with a small screwdriver and pull the wire out the back. New wire would just push in from the back until it clicks, then put the green plastic piece back in.
     
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