Gentlemen, I've been reading thru all the info in the thread, thank you all for sharing. I recently purchased a new 2020 2500HD WT Crew cab that had this kit in a bag in the back floor board. I was adamant with my salesman that something was needed to be installed or were these left over from an upfit package the truck had that they installed at the dealership. They really didnt know, so i ending finding the paperwork and then this thread. i actually have the entire upfitter kit for the aux switches. I don't know that i will need it but i may actually install it myself now. Thanks to all those that shared their install and the info provided.