2018 579 Peterbilt Wiring Diagram

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Brandon0928, Nov 30, 2022.

  1. Brandon0928

    Brandon0928 Light Load Member

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    May 14, 2022
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    Specifically looking for from the engine block heater/fuel heater plug in. Plug in to block heater. Where exactly does it connect to the fuel heater ? When looking from the plug in it looks like it goes over to the fuel separator but can’t find it. Have had another person wiggling wiring to find it and cant.
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    There is no specific diagram for the block/ fuel heater cord. The cord is most likely a combined cord that runs to the fuel heater and the coolant block heater.

    The fuel heater will be mounted in the frame mounted fuel filter housing. The harness will plug directly into the heater element at the bottom of the bowl near the drain.

    Block heater is normally on the passenger side of the engine.

    It’s easy to lose the cord under cab on the left side/rear of the engine under the cab. It will be buried/ hidden by other harnesses.
     
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