A power inverter just converts the power from your 12V source in your car to power able to be be used by home appliances such as a PS2. I haven't hardwired mine YET but all you would have to do is to cut off the cigarette plug and wire the power wire from the inverter to ANY 12V source (doesnt have to be the cigarette outlet wire), then ground the other wire securely to a metal contact on the body of the car.