i didnt hook up any relay to the video adapter. and it works just great. i did use a relay and pre ran the wires for the back up cam placed them behind my glove box. so when install it i wont have to take apart dash. relay was used to allow reverse to activate screen then switch to turn on while driving. the pic of the adapter doesnt show the latest unit the one you would receive has 2 video inputs.for the unit you do have to take the top off of the NAV unit and install the new ribbon wire, but it is very simple and the instructions are easy to understand.
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03 Black Lux
03 Custom Chopper
96 Road King
82 Vette
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