The 15A switch wire is violet with a green stripe.
This post helped me find where they are from the Ford Enthusiast site.
This one I just found is better. I think you have a 2013 and mine is a 2012 but they should be the same.
If you are mounting the camera lower there is no reason to run the wires through the TC at all. I just ran everything under the truck, wrapped in split loom and zip tied up to the frame. I built a 3' or so extension cord out of 2 flat-4 male/female (2 male/2 female) trailer wire plugs purchased at Walmart. These are fairly waterproof and allow me to shorten the wiring harness when the TC is off so it doesn't hang down.
