Old Britts – Simplified Wiring Diagrams
Download the complete PDF version using the green download button at the top right of this page for a useful Old Britts collection of simplified Norton Commando wiring diagrams. This reference breaks the electrical system into clear, self-contained sections covering charging circuits, ignition systems, lighting, electronic ignition arrangements and combined charging and ignition layouts, making complex Commando wiring much easier to understand.
This Old Britts technical article presents the wiring in simplified groups rather than as one full factory harness diagram. It includes stock single-phase charging with rectifier and Zener diode, voltage regulator and rectifier layouts, three-phase charging systems and alternator wiring variations, followed by ignition diagrams for points, Power Arc and Boyer systems in both positive and negative ground arrangements.
The guide also covers headlamp and turn indicator circuits, Boyer electronic ignition with a power relay, and a combined negative-ground charging and ignition diagram. These clear visual schematics make it a valuable reference for diagnosing faults, planning electrical upgrades or understanding how the main Commando electrical sub-systems connect together.
Contents Include
- Simplified Norton Commando electrical system diagrams
- Stock charging system with rectifier and Zener diode
- Single-phase charging with voltage regulator and rectifier
- Three-phase alternator charging diagram
- Two-wire and three-wire alternator wiring
- Points ignition with twin 6-volt coils
- Boyer electronic ignition wiring layouts
- Power Arc electronic ignition reference
- Headlamp and turn indicator wiring
- Boyer ignition power relay diagram
- Combined charging and ignition wiring diagram
