This wiring diagram for Volvo FM, FH, and NH12 trucks, identified by CHID codes A622782- and B433164, provides an in-depth overview of the electrical systems in these specific models. It includes detailed schematics that map out all the wiring connections, circuit pathways, and associated electrical components. This document is crucial for technicians and engineers for diagnosing, repairing, and maintaining the electrical systems, ensuring the vehicles’ optimal performance and reliability.