Peterbilt 379 Headlight Wiring Diagram. Web  The Peterbilt 379 headlight wiring diagram indicates that a 20A fuse is needed, which will protect against short circuits and short-circuit currents. In addition, in order to achieve optimal results, the fuse.

Web14) turn signals / hazard lights 15) stop lamps 16) marker / clearance lamps / left pole / right pole 17) headlamps 18) back up light switch 19) daycab ad / loadlights 20).