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I did exactly what you are talking about with my back up camera with my GPS (although my GPS is on switched power). I have a switch in the open part of the center console that powers the back up camera any time I want, but it also automatically comes on when in Reverse.
There is a couple ways of doing this:
1. Use a 4 post relay - 12v switched from an add-a-fuse on the pass. side power point fuse. Then the trigger for the relay is the reverse light wire found in the pass. side kick panel (green and white IIRC). You have your ground and then the power wire to the camera.
On the power wire to the camera, wire a switch inline that also has power from the add-a-fuse. So it bypasses the relay and gives power directly to the camera. ( no feedback to the reverse wires due to relay)
For the monitor - use another 4 post relay- this time with power from another switched source with an add-a-fuse and the trigger wire coming from the cameras power wire. So that anytime the camera recieves power, the relay gives power to the monitor. All of these are protected by relays and fuses now.
2. For extra protection use an extra relay in the camera's "on" switch circuit (I don't think its really necessary). Or you can use a on/off/on three way switch instead of any relays. Top post will be 12v switched, middle post to camera/monitor, and the bottom post connected to the reverse wire. So "up" on the switch is on, "middle" is always off, "bottom" is only on when in reverse. You could also use a relay on the trigger side (reverse wire).
Hope that made any sort of sense...I can draw you a diagram using paint - won't be pretty, but it will do the job.
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