I'm restoring a 1973 850 Interstate.
The leads down to the Zener diode have melted and I'm planning to ft a Swiss 790 (Royal Enfiel) regulator rectifier in place of the original Zener diode and rectifier set-up.
While I have the rear part of the harness apart, I've discovered some 'spare' wires that I'd like to strip out to reduce the bulk of the harness.
I have a white/red and a white/purple terminating just behind the oil tank. I assume the white/red is for the starter motor, (which I don't have), but the white/purple isn't in any of the wiring diagrams that I've checked. Any ideas what it was intended for, or where it goes???
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White/Purple
This is the connection between the Ballast resistor and the ignition coils. The W/P in the area of the oil tank would have been a connection to the starter solenoid to take out the ballast resistor on a MkIII with twin points. Electronic Ignition and non starter models make this wire redundant.
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Head over to https://granttiller.com/norton-commando-wiring-diagram for a plethora of info on Commando wiring.