I've got a 99 379 with a series 60 and none of the wiring diagrams I've found seem to coincide with the ecm wiring on this truck.
I stopped at a loves last night to change my coolant level switch and coolant temp gauge and must've jostled something behind the dash because afterwards my ecm didn't have power but the ecm fuse was good and had power.
I've wired up a harness from the battery for now but I want to fix it properly once I get home.
Is there any diagram that anyone has that'll show the ecm switched power circuit?
99 379 looking for ecm fuse wiring diagram
Discussion in 'Peterbilt Forum' started by simonsocm, Aug 15, 2021.
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So you had all dash power, but wouldn't start?
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Go to the dealer, give them your vin and have them print off the wiring diagram for your truck.
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Big Road Skateboard Thanks this.
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If you install an inline fuse in the wire that you installed and heat shrink/zip tie it properly you will be better off for the next time that you have a potential ecm power issue problem.
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So it's half decent at least. -
Found the issue.
There's a silver box up on the firewall on the passenger side of the engine bay that houses the two ecm fuses. There's a wire terminal block where they connect to the wiring from the battery before going to the ecm fuses then to the ecm. The wire terminal block was completely corroded.Attached Files:
Trcknwolf, Luwi67, QUALITYTRUCK and 1 other person Thank this. -
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I wanted to post the terminal that I used for anyone else that has a similar issue. The two post terminal is no longer available at Peterbilt and the original company no longer makes them. Painless Performance makes literally the exact same 2 post terminal however. I found mine on amazon. Part # is 80112 and they call it a junction block.
Ky Flash Thanks this.
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