Just wanting to add to this particular subject, in case someone else searches in the future and runs into the problem I did this afternoon.
I just added the ORO LitePlate as I was told when I went in for inspection a 3rd brake light was now required.
For the 3rd brake light my tailgate wire bundle did not have a white/brown trace wire in the bundle at all. I followed the wire bundle to the plug behind the small black vent in the tail gate and realized there was a black and white/green trace there. I tested and confirmed the white/green trace was the correct wire, and then soldered the connection.
Dont know why mine was different than everyone else's, but if anyone else has the issue, at least this may help.