Reply To: Wiring Diagram Needed 1958 Bigtwin

[Don]

Glad you found what you needed, let us know if you have further questions.  It is very important to remember that the two “M” terminals on the key switch must not be used as grounds for any accessories, these are the two mag primary leads that get shorted together to stop the engine.  Using these terminals as a ground for some other accessory will fry your coils…