2018 Peterbilt 579 Wiring Schematic Needed
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Thekenzieann, Dec 10, 2019.
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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
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Have 2017 Pete 579 with no turn signal on the trailer. -
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. -
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Which turn is out?
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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. -
Goodysnap Thanks this.
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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.
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