This manual covers FM and FH series trucks and wagons manufactured up to September 2007, specifically for Version 2 models. Trucks are renowned for their robust engineering, reliability, and focus on safety, making the FM and FH series popular choices in the heavy-duty commercial vehicle segment. These vehicles are designed for a wide range of applications, from long-haul transport to vocational tasks, offering powerful engines and durable drivetrains.

This wiring diagram manual provides comprehensive coverage of the electrical systems for these trucks. It includes detailed schematics for all electrical circuits, component identification, harness routing, connector pinouts, and wire color codes. The manual is an essential resource for technicians and owners, offering in-depth information on powertrain, chassis, and body electrical systems, as well as troubleshooting charts and guidance for electrical repairs. Its detailed diagrams facilitate accurate diagnosis and maintenance, ensuring the optimal performance and longevity of the vehicle's complex electrical infrastructure.