2018 Peterbilt 579 Wiring Schematic Needed

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

  1. Saintflina81

    Saintflina81 Bobtail Member

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    Feb 16, 2020
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    Wow is this at the dealership
     
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  3. BBA_IN

    BBA_IN Bobtail Member

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    Jul 22, 2021
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    I know this is an old thread, but I’m having a similar issue with turn signal problems on a 2019 Peterbilt 567. Is there any good source for wiring schematics @pushbroom ?
     
    Last edited: Jul 22, 2021
  4. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    HI. Did you solve your problem?
    Have 2017 Pete 579 with no turn signal on the trailer.
     
  5. Goodysnap

    Goodysnap Road Train Member

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    Underhood fuse box

    LH trailer turn is J4
    RH trailer turn is J6

    Shorts in trailers blow truck side fuses- If you need pinouts let me know.
     
    pushbroom Thanks this.
  6. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    I checked those two fuses at first and they are good unfortunately.
     
  7. Goodysnap

    Goodysnap Road Train Member

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  8. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    Driver side
     
  9. Goodysnap

    Goodysnap Road Train Member

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    Chassis Node under the cab below your feet. Remove connector B- Top RH toward the trans. Spray the connector with soap and water and blow the dirt out if you can. Plastic bails are fragile and break.

    Power in from fuse J4 is Pin 19
    Power out to chassis harness is Pin 16

    It is common for rubs and corroded wires at or around the chassis node and bracket. Look for rub spots before you start moving things around or green trails of corrosion. Pull the plastic shell off the connector and give the wire a pull test at the node too.
     
    pushbroom Thanks this.
  10. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    OK. Thank you for information! I will try it tomorrow.
     
    Goodysnap Thanks this.
  11. Lookunderthetruck

    Lookunderthetruck Bobtail Member

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    Nov 18, 2020
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    Goodysnap- hello there,
    I've got a fuse (L8 aftertreatment) that keeps blowing on a 579 Pete with a Paccar MX13. I swapped out the wire harness to the def pump, but it still blows. At first it happened when I hit a bump, now it's whenever I go, no bump needed. I suspect it could be on a wire that received the harness, I want to look closer at the level/temp sensor, but it's a little hard to get to. What are your thoughts? Ever hear of this particular fuse consistently blowing? I don't have a schematic. Is there a spot closer to the fuse box itself I should be looking at? Any help on this would be much appreciated.
    -Regards
     
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