I saw on the internet in japan where a man, hooked up a car alternator to his back wheel, friction drive, mind you this was on a peddle bike, to charge a battery, that ran his lights, which were a lot, he had two fog lights in front, two side lights two one each side in the back used as turn signals, as well in the front, plus a stop light from a trailer in the rear all 12 volt. the alternator was 30 amp, 12 volt, which keep his battery charged. Keep in mind the alternator was a one wire, with a voltage regulator built in, so no extra parts need other then a trigger wire form a switch when lights are turned on. This setup will run a starter as well, and is simple to setup. I believe this is the answer to the light problem, running a 12 volt system. I will set this up after I get more used to my bike.