The reverse input power should probably come from your reverse lights. This will be what triggers the camera to display.

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That's what I figured, just never seen both wires before.

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I just installed mine and it had a similar wiring configuration. I wired up the power to the camera to reverse and then plugged the camera into my Edge and it worked without running the input wires.

 

There's a couple ways to do this.
Tap the brake trigger wire from the truck (I think I went from/close to the fuse box) to the camera trigger wire on the radio (purple I think). Now, hook the 12v to the power wire built into the rca cable, and then the rca cable + to camera +, ground the camera anywhere.

Or, use the rear brake light + to camera AND rca power wire, then rca + to stereo trigger.

Or, back up switch in cab to stereo trigger, camera + to reverse light +, no need for the rca +

Or, rca + to brake trigger and radio trigger, then rca + to camera.

The. First one is easiest. I also put a toggle switch on mine, since I don't always want the camera on

 

I hooked the 12v camera wire to the red wire on the RCA and ran a separate wire from reverse input to hot wire of the backup light. Camera comes on if I turn the camera on inside the radio from menu, but when I put it in reverse it doesn't trigger it on.

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