Simplified Wiring Diagrams - Old britts, Norton Motorcycle 1975 1973-74 1972 1971 1969-70 1966-68 General Our products. Simplified Wiring Diagrams. Summary: This article will hopefully simplify the wiring on Norton Commandos. We will breake out the wiring into self contained groups, ignoring all components except what is included in that group. Bill's Norton Commando Mk II Wiring diagram Introduction. Here is a full color wiring or electrical diagram for the 1974 Mk II Norton Commando. It is based on the black and white diagram in the official workshop Norton Commando MK3 Wiring Diagrams | Jerry Doe Norton Commando MK3 Wiring Chuck Ridenour (AKA Saber13 forum member) has taken the time to make some nice color/colour wiring diagrams for the MK3 Norton Commando. Please take a moment to thank Chuck on the forum if you use his diagrams (username Saber13) or have any feedback.