2018 Peterbilt 579 Wiring Schematic Needed

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Thekenzieann, Dec 10, 2019.

  1. Thekenzieann

    Thekenzieann Bobtail Member

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    Dec 10, 2019
    Utah
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    Can anyone attach the schematic for the exterior lights on a 02/2018 Peterbilt 579??

    It would be greatly appreciated

    xx
     
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  3. buckeyetrucker

    buckeyetrucker Light Load Member

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    Jan 11, 2009
    Ohio
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    Are you having fuse problems or headlight problems?
     
  4. pushbroom

    pushbroom Road Train Member

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    What lights and what problem are you haveing?
    Also a serial number usually helps.
     
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  5. Thekenzieann

    Thekenzieann Bobtail Member

    10
    3
    Dec 10, 2019
    Utah
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    Aaaah yes a serial number ‍♀️ I can get that when I am near the truck again.

    My front marker lights on the trailer and marker lights on the headache rack intermittently don’t work. However the more I think about it the headache rack is aftermarket and I’ll probably have some luck looking at how that got spliced into the wiring.

    I appreciate the quick responses!
     
  6. buckeyetrucker

    buckeyetrucker Light Load Member

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    Jan 11, 2009
    Ohio
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    I would have a dealer check the wiring harness from the chassis node to the front fuse box. I started blowing fuses and finally had lights go out with fuses not blowing. Evidently the 579 wiring harness is known for getting holes rubbed in wires when it goes over frame. It’s under warranty til 300000 miles. Mine was at 306 and I’m fighting with them over who’s gonna pay the 3000 dollar bill since it was obviously bad before 300000 and it’s a known problem.
     
  7. pushbroom

    pushbroom Road Train Member

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    If its the trailer and the headache rack whoever installed the rack probably put a junction box in the trailer cord in the frame rail. Start there
     
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  8. TNKYTRUCK

    TNKYTRUCK Bobtail Member

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    Feb 13, 2020
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    Has anyone had trouble with 2017-2018 Peterbilt 579 ABS wiring harness? I have 11 of these 579s and almost everyone of them is having wiring problems. Paccar has only covered some of the issues under warranty/policy and now they won't help at all. I'm considering suing them over my downtime, tow bills, etc. They want to charge me over $6000 to replace this wiring harness.
     
  9. buckeyetrucker

    buckeyetrucker Light Load Member

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    Jan 11, 2009
    Ohio
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    I just had to replace the harness from the chassis node to the fuse box because the way it’s set up, it runs over the frame and rubs a whole in it. Have you tried talking to one of their regional managers? They were going to charge me 2600 for my repair after they adjusted the bill a little. Got it covered by #####ing up a storm to the regional guy.
     
  10. spsauerland

    spsauerland Road Train Member

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    May 31, 2010
    West Harrison, In
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    Yes, many problems from bad harness routing/improper securement. Not sure what is going on in Denton. Much better workmanship @KW in Chillicothe. He should of bought KW's @pushbroom!!!
     
  11. pushbroom

    pushbroom Road Train Member

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    Loom to hockey tape was an issue. Harnesses were 1500$ but there was a different one for every truck. They amalgamated 100's of harnesses to simplify the part stocking and also the price shot up to 5g a harness. Recently they have gone back to loom. Should be as good as pre 2017.

    Id replace a harness every week if it meant i didnt have to drive a kw @spsauerland :)
     
    Goodysnap and spsauerland Thank this.
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