Re: Did you use the relay with your HitchCam?
Yeh  run the wire through the vent and out where the duct connects to it .(or drill a small hole in the duct you cant see it.)
As for the wire,use a positive wire(off accy plug or in the cluster to right of the wheel towards head unit )and use a relay to power it off a keyed power,the yellow wire going to the rear wiper switch works with the key fwd and back ,run it to coil side of relay use the 12v power wire on the other side.
The relay comes with a diagram. 
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