Peterbilt 520 intake heater relay location

Discussion in 'Waste Removal and Garbage Truck Driver Forum' started by barcelonaleo, Jun 18, 2023.

  1. barcelonaleo

    barcelonaleo Bobtail Member

    Feb 22, 2023
    Have been working on a Peterbilt 520 refuse truck with the cummins L9 360 engine and have had a active code for engine intake air heater 1 circuit. I'm trying to diagnosis it but i am having trouble locating the possible location of the relay and/or fuse that may come in these trucks. Because from my knowledge peterbilt and other brands all put them in different locations. Would anyone know where this relay be located?
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