This manual provides comprehensive wiring diagrams and electrical system information for trucks. Trucks, a brand with a rich heritage dating back to 1947 and a key part of Daimler Trucks North America, is renowned for its heavy-duty trucks, including popular model lines such as the Cascadia, Coronado, M2, and SD Series. These vehicles are engineered for demanding vocational and over-the-road applications, offering a range of powerful diesel engines and robust transmissions designed for reliability and performance. Trucks are built to meet stringent federal safety standards and are recognized for their innovation and durability in the trucking industry.

The scope of this service manual is focused on the intricate electrical systems and wiring harnesses that are fundamental to truck operation. It offers detailed system-level and component-level wiring schematics, covering essential areas such as engine control, powertrain, chassis electrical components, braking systems, instrumentation, HVAC, interior systems, and safety features. The manual includes component locations, connector pinouts, fuse and relay information, and wiring harness routing. It is an indispensable resource for truck technicians, fleet maintenance personnel, and owner-operators, providing the necessary diagnostic procedures, troubleshooting guides, and repair information to efficiently maintain and resolve electrical issues, thereby minimizing downtime.