The lighting system is ran off the stator. There are 3 total coils and 2 of them are for the lights. The power wire is yellow with a red stripe. You may want to get an owners manual if the original wiring harness is gone. Also, check your voltage prior to hooking up the lights, be sure your voltage regulator is functioning correctly. faulty voltage regulators will make quick work of your lights.
Welcome to Zilla ownership. Pain in ass at first, but well worth the instant gratification you get when mashing on the throttle of a big bore 2-stroke.