Converts your 6V positive or negative ground to 12V 4 Amps. This ballast if for dual filament headlights that have both a low beam and a high beam. This is for vintage and classic cars, trucks, tractors and motorcycles. Easy to install disconnect the input control wire low beam and connect to the input of the low beam ballast input. Then connect the input of the high beam to the input of the high beam ballast input. The output of the ballast has both a lo and hi beam output that you must connect to the headlight socket. Now you can operate any 12 volt dual beam headlight using your existing stock 6 volt system. Compatible with: motor, audio, navigation, monitoring, led, air conditioning, electric fans, solar energy, photo voltaic energy, DVD or CD player,head lights, motors, pumps and industrial equipment. Works great for Model T, Model A and other 6 Volt cars, trucks or motorcycles.