Since the OBD2 cable is just constant power and ground without an IGN or ACC input, am I correct to assume the camera knows when the car is running and begins regular recording when it senses the voltage rise from the vehicle's alternator? If so, can I just use a 2-wire fused lead with the same barrel connector as the included OBD2 cable? Or even just cut off the OBD2 plug of that cable and hardwire to 12Volts? Fused of course.