The absolute cleanest way to wire it up is use something like a Sebring Box or (battery eliminator type unit) and for non mag ignition a Honda 160 coil. The light toggle if you can hide it somewhere on the light houseing ( bottom?) and that way you only run 1 hot wire to the bucket, and but your Hi-Low next to it. May need ground line depending on light wattage.
Wiring:: the 2 stripped wires from alternator to sebring box, from box red wire to head light & hi-low & brake& tail.
white would normally go to coil, green to ground.
if not using a battery elimanator then 2 alt wires to retifier, capacitor off 3rd prong on rectifier, rect. & capacator must have good ground, same prong as capacitor line goes to lights and zener diode . the capac. and diode absorbe high voltage off rectifier so you don't blow bulbs at anything over an idle. Send your fax # a picture is worth 1000 words
very simple to do. Sebring type box worth the money.