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Motorcycle Electrical Systems & Wiring

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Use these pages to service and troubleshoot your motorcycle’s electrical systems. Refresh your old wiring harness or learn how to build one from scratch.

The electrical systems on many old bikes – especially ones that have been sitting for a long time exposed to the elements – can be a source of all sorts of problems. Learn how to identify and avoid them with the information in this section.

General Electrical Tips for Your Motorcycle

Motorcycle Electrical Systems & Wiring Diagrams

Bike-Specific Tips

CB750, KZ650, XS650 Ignition Timing

Here are the ignition timing procedures on some common project bikes.