This wiring diagram provides a comprehensive overview of the electrical systems for Volvo FM and FH trucks. Covering CHID codes A689836–, B548688–, D131669–, E750419–, W100028–, and CKD887300–, the document details the wiring layouts, circuit paths, and connections specific to these models. Essential for technicians, it serves as a critical resource for troubleshooting, repairing, and maintaining the electrical integrity of the trucks, ensuring accurate diagnostics and efficient repairs.