Most have a 12V AC winding that you can power the headlight off if it is an old fashioned filament type. If it is an LED type you need to pick up a regulator off an electric start and wire it in to get DC 12V - just look for a wiring diagram for a bike with light and you should be able to figure it out. If you are really stuck I should have some notes here somewhere, but they will be hand drawn.
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