You are in an area now that I know nothing about. For mechanics, the days of being able to modify circuits and add stuff is long gone. The insane engineers have seen fit to hang an unnecessary, unreliable computer onto every single part of our cars, and a lot of that stuff has no benefit for the car owner. There are no denying airbags and antilock brakes are worthwhile, but there is no reason to involve two computers in blowing the horn. There is no benefit to replacing a simple, reliable back-up light switch with a back-up light switch that tells a computer to turn on the back-up lights.
Rather than watch you try to resolve issues caused by aftermarket parts with more aftermarket parts, I would recommend reinstalling the original radio to be sure everything comes back to life, then use the radio relocation kit so you can keep that radio in the truck, but out of sight. You can still put the new radio in the dash.
Monday, December 26th, 2016 AT 6:15 PM