This manual covers FM Series, FH Series, and NH Series trucks manufactured up to August 2003. These robust vehicles are engineered for heavy-duty applications, known for their reliability and powerful performance. The FM, FH, and NH series trucks represent a significant part of a legacy in providing durable and efficient transportation solutions, often featuring advanced engine technologies and comfortable cab designs for long-haul operations. Specific models included are the FM9, FM12, FH12, FH16, and NH12 trucks, with chassis identification (CHID) ranges A572084- and B351630- being relevant for identifying specific configurations.
This Wiring Diagram and Electrical Troubleshooting Manual provides comprehensive coverage of all electrical systems and components within the specified truck models. It details wiring for powertrain, chassis, body, instrumentation, diagnostics, and interior systems, including engine management, transmission control, lighting, HVAC, braking systems, and various sensors. The manual is designed to assist professional truck technicians, fleet maintenance personnel, and advanced mechanics in accurately diagnosing and repairing electrical faults. It includes detailed circuit diagrams, component and connector identification, fuse and relay information, earth connection locations, wiring harness layouts, and pinout diagrams, empowering users with the technical depth required for effective troubleshooting and maintenance.
Wiring diagram
FM9 FM12 FH12 FH16 NH12
UPTO AUG 2003
VERSION2
FM, FH CHID A572084-
FM, FH CHID B351630-
Contents
Example of wiring diagram ................................................................... 2
Component wiring diagram index ........................................................ 5
Component wiring diagrams ................................................................ 7
Illustrations index ................................................................................ 81
Illustrations ........................................................................................... 82
Fuses ................................................................................................... 155
Relays ................................................................................................. 157
Wiring harness illustration index ..................................................... 159
Earth connections ............................................................................. 162
List of earth connections .................................................................... 164
List of connectors .............................................................................. 165
List of components ............................................................................ 172
Abbreviations ..................................................................................... 178
Cable colour code .............................................................................. 179
Wiring diagram
FM9 FM12 FH12 FH16 NH12
UPTO AUG 2003
VERSION2
FM, FH CHID A572084-
FM, FH CHID B351630-
Contents
Example of wiring diagram ................................................................... 2
Component wiring diagram index ........................................................ 5
Component wiring diagrams ................................................................ 7
Illustrations index ................................................................................ 81
Illustrations ........................................................................................... 82
Fuses ................................................................................................... 155
Relays ................................................................................................. 157
Wiring harness illustration index ..................................................... 159
Earth connections ............................................................................. 162
List of earth connections .................................................................... 164
List of connectors .............................................................................. 165
List of components ............................................................................ 172
Abbreviations ..................................................................................... 178
Cable colour code .............................................................................. 179
