I have low milage dr 370 that I am trying to convert to a street legal enduro.it is a1978.i have installed a UFO 12 volt head and tail lights. Problem,it was made as a 6 volt system. I have a wiring harness from Dr Enduro for lights turn signals ,ect. can I use a voltage regulator to get proper voltage to lights,or do I also need a rectifier.