Originally Posted by
Winfried
I read that one wire is the phase (where current flows from the generator to the light), and the other is the neutral (light → back to the generator.) Where does ground/earth go then?
I re-read your post and see that nobody has addressed this. There is no separate ground and neutral. If there is a neutral connection on the dyno, it is also shorted to the frame.
You can use either the frame or a wire to the neutral connector to complete the circuit. My experience is that using the frame works fine, but sometimes requires a bit of fiddling. And sometimes corrosion causes problems. In any event, you have to keep the fact that the frame is ground in mind when wiring or the system will fail.