Always verify if your truck is equipped with the PACCAR MX-13 or the Cummins ISX15. While the cab fuse panel is identical, the under-hood power distribution center differs slightly between engine packages.
While this reduces wiring weight and complexity, it changes how fuses work. A blown fuse might disable a module, which in turn could cause several other systems to fail simultaneously. Therefore, reading a requires identifying not just the component, but the module controlling it. 2015 Peterbilt 389 Fuse Panel Diagram
The 2015 Peterbilt 389 has . Knowing which one to check is half the battle. Always verify if your truck is equipped with