Old Britts – Norton Commando Starting Capacitor Guide
Download the complete PDF version using the green download button at the top right of this page for an Old Britts technical guide covering starting capacitors used on Norton Commandos. This reference explains the function of the starting capacitor, differences between original and replacement units and the wiring changes required when fitting modern replacement capacitors to classic Norton motorcycles.
The guide compares original Norton capacitors with current Andover Norton and economy replacement versions, showing differences in terminals, mounting springs and polarity markings. It explains how the capacitor assists starting when battery voltage is low or when running without a battery fitted, while also outlining correct positive and negative lead identification before installation.
Detailed installation notes cover modifying the original wiring harness, joining the brown and blue negative wires, replacing terminal ends and adapting connectors to suit modern replacement capacitor terminals. The article also explains the different connector arrangements used on original and replacement capacitors and includes recommendations for crimping, soldering and heat-shrinking the terminal connections.
Contents Include
- Norton Commando starting capacitor overview
- Differences between original and replacement capacitors
- Andover Norton and economy capacitor comparison
- Positive and negative lead identification
- Starting assistance when battery voltage is low
- Running without a battery using a capacitor
- Wiring harness modification instructions
- Brown and blue wire connection changes
- Terminal conversion and connector sizing information
- Crimp, solder and heat-shrink installation guidance
- Capacitor mounting spring details
- Replacement capacitor part numbers and references
