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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
Lost Motorcycle Keys Clean the Electrical Connections on Your Motorcycle Troubleshoot Electrical Starting Problems Motorcycle Points Ignition Timing
Motorcycle Electrical Systems & Wiring Diagrams
Motorcycle Batteries & Charging Systems How to Use a Wiring Diagram Build a Simplified Wiring Harness Motorcycle Alternators Types of Motorcycle Batteries
Bike-Specific Tips
CB750, KZ650, XS650 Ignition Timing
Here are the ignition timing procedures on some common project bikes.