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?
Peterbilt 520 intake heater relay location
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by barcelonaleo, Jun 19, 2023.
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