2017 Peterbilt 579 Headlight question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by stark21, Oct 29, 2020.

  1. stark21

    stark21 Light Load Member

    107
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    Jul 25, 2010
    Tunkhannock PA
    0
    does anyone know what pin controls the highbeam on the hood harness, all my lights work except the Right High Beam, checked fuses and they are all good, and I ran power straight to the headlight and it worked so I know it's not the actual light that's bad.
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    From chassis Node under drivers feet. Connector A pin 7 is hot to RH high beam. Pin 4 at chassis to hood connector.

    Pay close attention to the hood harness as it wraps around the hood support and near the bug screen.
     
    pushbroom, QUALITYTRUCK and stark21 Thank this.
  4. stark21

    stark21 Light Load Member

    107
    3
    Jul 25, 2010
    Tunkhannock PA
    0
    ok thanks will check those pins out, I had one pin on the hood harness that looked kinda bad but sprayed them with some electric cleaner.. but it was pin 2 that was the one I thought was bad on hood harness.. thanks again..
     
  5. stark21

    stark21 Light Load Member

    107
    3
    Jul 25, 2010
    Tunkhannock PA
    0
    and by the chassis node do you mean the one that's in the battery box compartment I know that's where the aftertreatment control module is
     
  6. Goodysnap

    Goodysnap Road Train Member

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    Chassis Node has 3 connectors A,B,C. Right beneith your feet under the cab.
     
  7. stark21

    stark21 Light Load Member

    107
    3
    Jul 25, 2010
    Tunkhannock PA
    0
    yep just found it, if I counted the pins correct it has power and nothing on the node looks bad or corroded. and nothing looks bad with hood harness pin 4. if I can't figure it out I guess I can just wire the one light via a switch inside to turn that on.. this truck is just been a pain.. just purchased and put in 30k worth of parts to fix.
     
  8. Goodysnap

    Goodysnap Road Train Member

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    Connector A Pin 7 will not be hot when disconnected. Jumper power to pin 7 at the node. Check for power at pin 4 of the chassis side At the hood harness connector. If good follow up to the headlight. Do you know if your missing power or ground?
     
    pushbroom Thanks this.
  9. stark21

    stark21 Light Load Member

    107
    3
    Jul 25, 2010
    Tunkhannock PA
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    ok will try doing jumper method in morning.. also I have had quite a few electrical issues so it could be a ground issue. where would be the ground for the hood harness be.
     
  10. Goodysnap

    Goodysnap Road Train Member

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    Ground is white 9 & 10 chassis/hood.
     
    pushbroom Thanks this.
  11. stark21

    stark21 Light Load Member

    107
    3
    Jul 25, 2010
    Tunkhannock PA
    0
    ok will check it out.. thanks again. I do know the pin 10 on my hood harness is empty no wires going to that one.
     
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