GM Full-Size Trucks 1970-1979 Repair Guide

Fuses and Flashers


Fuses are located in the junction box below the instrument panel to the left of the steering column. The turn signal flasher and the hazard/warning flasher also plug into the fuse block. Each fuse receptacle is marked as to the circuit it protects and the correct amperage of the fuse. Inline fuses are also used on the following circuits: 1970-75, ammeter; auxiliary heater and air conditioning 1973-74; and underhood lamp and air conditioning 1975 and later.

A special heavy duty turn signal flasher is required to properly operate the turn signals when a trailer's lights are connected to the system.