Hmm than it should let you see the video from the camera. Or it might be waiting for a signal from that reverse wire. But I am not sure. So you are sure the revers purple wire is not hooked up to anything? Also do you know how to use a volt meter? He is what I am thinking you should do. Go to your tail lights look at the owners manual on how to replace a backup light bulb. Take the light bulb fixture out and look at the wires. One of them has to be +. Find out which one by using the volt meter or just trying them one by one with the purple wire. Once you have found which one it is. Find it in one of the other areas and tap into it. I think you should be able to find it that way.
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