Originally Posted by rohmell
The white wire from the engine is an output, and is normally used to run a light.
The black is ground and the blue is the output from the magneto.
The kill switch should be connected to the black and blue wires, the white wire should be taped up and tucked away if you are not using a light.
This is exactly how to hook the killswitch up. Yes, hooking it up to a ground does work but there are some setups that isolate the engine so well that the point of contact is the cables, not a good ground. I ran a wire from the chain guard mount on the motor to one of the water bottle holder bolts. Then whatever grounds for electronics hook up there but I still have the killswitch connected to the two magneto wires.