Well either way, so long as you have your camera powered by the reverse light (red is the +12v) and the the appropriate wire connected to ground (otherwise the white wire), you camera should be receiving power. Just double check your grounding connection and if in doubt, connect the camera ground to the white wire of the reverse light. Judging by the fact that you mentioned it said to connect it to the reverse light, means that the camera is a 12v camera so it shouldn't be a voltage issue (head unit provides 6v for a camera). Only other way to find out is to connect the camera to a TV or something with a composite video in and see if it works properly. The only way to easily tell if the camera is PAL or NTSC is to connect it to a receiver that can be forced onto PAL or NTSC and see which one it works with. Testing the camera would be a wise choice if you can. As well, as stupid as this sounds, make sure that the shield of the video lead does not come into contact with the conductor. It won't break anything, but it sure would affect the signal.