Norton Commando Wiring Diagram + Tri-Spark + cNw + Podtronics

Grant Tiller

As promised, below you will find the wiring diagrams which have been modified to include Tri-Spark electronic ignition, the Podtronics regulator/rectifier and the Colorado Norton Works Electric Start Conversion.

Pre-1971 (ammeter in the headlight shell and Wipac Tricon type handlebar switch) PNG 3066×1841

Grant Tiller

1971 (three wires to the master switch) PNG 3066×1841

Grant Tiller

1972 onwards (four wires to the master switch) PNG 3066×1841

Grant Tiller

Very popular modifications giving you a bike that is suitable for modern day motorcycling!


A couple of points about the way these diagrams have been drawn:

  1. Where the same colour wire goes in to and out of a single connector, that connector has usually been omitted from the drawing.
    It’s obvious on the bike, is easy to spot and easy to troubleshoot.
    Leaving them off the diagrams makes them a LOT easier to read, and considerably less cluttered.
  2. Wherever the earth or ground side of a component goes back to the battery, the drawing shows a red earth symbol:
    Grant Tiller
    In reality, this could be connected either to a red wire in the bike’s wiring harness (loom) OR it could be attached to the frame or engine of the bike.

    I have shown the red earth symbol each time in order to massively simplify the diagram, and make it a lot easier to understand for everyone.

    I have also coloured them red as a gentle reminder that these bikes are wired positive earth!

1 reply

  1. Grant, what program are you using to do these? I’m specifically interested in the ability to get the two colors on the wires. Thanks, David

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