Its is actually very simple, I have installed a total of about 10 sets on cars, and 2 on motor cycles. The wiring that runs to the headlight consists of one ground wire, one high beam, and one low beam. Simply connect the ballast to the ground, then to the highbeam wire. Use a tester to determince which is the highbeam. Now you can control the HID on and off with the highbeam switch. I am looking for a bulb adapter for the projector lens. I belive its HB4? Does anyone know where to find it?