good luck with this.
i've been trying to get a headlight to work on my bike for 3 weeks using the white wire.
i even re-wired my light so it has 2 wires (a + and a -). every time i ground the - to the frame, handlebars, sissy bar...anywhere on my bike that is metal... it kills the motor. for some reason there is 5 volts of juice running through my frame when the engine is running. so when i hook up the ground, it shorts out the ignition and kills the motor.
yes, my motor is mounted to the frame with rubber pads and i even tired to isolate the headlight with rubber...to keep the mount from actually touching any part of the bike. but since my frame and all components get a positive charge with the motor running, when ever i hook the ground wire to the frame it's the same as if i push the kill switch.
i am no dummy and i have tired EVERYTHING to get it to work. i even tired hooking up a wheel driven generator to get away from using the white wire. as soon as i got the motor running, the 6 volt wheel generator blew because of the positive charge. for some reason, my bike does not have an actual ground when the motor is running.
i can not figure it out and i've tried everything.
i have messed with electronics, ignition systems, charging systems and electrical for years and this one has me puzzled.
i hooked the headlight to a 6 volt battery charger and it works great so this is not a problem with the headlight.
if you get yours to work, let me know how you did it.
i was told that if you hook a headlight to the white wire, it will take away some of the power going to your cdi box. the white wire is hooked directly to the magneto, just like the blue wire. the magneto output is like 6 volts so trying to send 6 volts to the cdi, and then 6 volts to the light...something has to NOT work because there isn't enough voltage to run both.