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Marker light dimmer/flasher not working on a trailer

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jacoooooooo, Nov 27, 2019.

  1. Nov 27, 2019 #1
    Jacoooooooo

    Jacoooooooo Heavy Load Member

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    Hello everyone.
    So I picked up a brand new Wilson trailer and I cannot dim/or flash marker lights on it using the button on a steering wheel on my truck (Volvo). They do dim/flash on a truck, but nothing happens on a trailer. Worked just fine on every other trailer I had before.
    What could be the reason?
     
    Jacoooooooo, Nov 27, 2019
    Jacoooooooo, Nov 27, 2019
    #1
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  3. Nov 28, 2019 #2
    loudtom

    loudtom Road Train Member

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    One wire feeds the clearance lights, the other is marker lights or something. It's possible that they wired the whole trailer to be on one wire, which happens to be the one that isn't linked to the switch. Should be the brown and black wires on a 7 round plug.
     
    loudtom, Nov 28, 2019
    loudtom, Nov 28, 2019
    #2
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  4. Nov 28, 2019 #3
    Oxbow

    Oxbow Road Train Member

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    Most likely a jump wire between the black and brown wires like @loudtom stated, probably right where the wires attach to the back of the female plug on the trailer.
     
    Oxbow, Nov 28, 2019
    Oxbow, Nov 28, 2019
    #3
    Jacoooooooo Thanks this.
  5. Nov 28, 2019 #4
    Jacoooooooo

    Jacoooooooo Heavy Load Member

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    Means that I will not be able to fix it?
    It’s a Grote wiring on the trailer.
    I would think it should be standardized.
    Or, ok I see. So maybe I could swap those cables on a 7-round plug than...
     
    Jacoooooooo, Nov 28, 2019
    Jacoooooooo, Nov 28, 2019
    #4
    Oxbow Thanks this.
  7. Nov 28, 2019 #5
    Oxbow

    Oxbow Road Train Member

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    Well swapping on the male (pigtail) won't help. If you remove the receptacle on the trailer you will likely find a jump wire between the brown and black. Should be able to just remove the jump wire.

    Edit to add: it will be the wires on either side of the bigger top wire which is the ground.
     
    Oxbow, Nov 28, 2019
    Oxbow, Nov 28, 2019
    #5
    blairandgretchen, spsauerland, Jacoooooooo and 1 other person Thank this.
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