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To close the loop on my own post for future generations, I ran the 12v, ground, and backup up to the MMI unit. On my model the camera signal and reverse wire are bundled in the same cable so it was easy. I used a wire nut to connect the ground and 12v output from the camera to the MMI 12v ACC and ground. Be cautious when wiring it behind the convertible top; if not done correctly the top mechanism will cut the wire! It needs to go completely behind the entire mechanism. This is not always obvious as you can't get a good view from outside the trunk and it is easy to thread the cables through the mechanism if you aren't looking from the right angle.
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