Wiring confusion - 1972

Discussion in 'Norton Commando Classic Motorcycles' started by BrianG, Nov 3, 2017.

  1. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    right above the carbs there is a main harness tap that throws 3 red (gnd) wires to one ring connector that goes to the head steady, and it also throws 2 white/red wires.

    I cannot even find white/red wires on the '72/'73 wiring diagram.. Any ideas what these are for?

    Also, at the front of the main harness, there are quite a number of black/white and black/yellow wires, some terminating in bullet connectors and some in female spade connectors.

    This bike has an early Boyer ign. installed so I suspect that these are related to the OEM points ign. ? My wiring diagram does not show wire colors past the ballast resistor. Can I presume that it is safe to ignore these wires? (I do not find them to be powered at any position of the ignition switch)
     
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  2. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    White/red is the unused electric start push button-to-solenoid wire (so the wire will be live/hot when the button is pressed), as the factory intended to fit a Lucas electric starter from 1971, however, it proved unreliable so the Commando didn't get an electric starter (Prestolite) until the 850 Mk3.

    Correct, the black/white and black/yellow are the unmarked original points/condenser wires on the wiring diagram.

    The unmarked ballast resistor-to-coils wire was normally white/purple.
     
    Last edited: Nov 3, 2017
    BrianG likes this.
  3. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Thanks!
     

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