Very good write up and I wish I would’ve found this forum and Mike before I took the leap to do all this myself. My plan was just to upgrade my 5 inch radio to a 8.4 with NAV. My truck is a 2014 RAM 1500.
I started out by purchasing a harness off of eBay. I already had the radio that I purchased also off of eBay. The harness arrived the radio arrived two separate transactions and I installed the radio and the harness. Everything seemed to work on the radio except I could not control the temperature. When I plugged the knobs back in to control my HVAC system, they worked flawlessly. However, every time I plugged the harness into my new electronic bezel control there would be temperature issues and other issues started showing up with the HVAC system.
I tried to get my money back through the seller and will post the interaction below.
Sorry for so many screenshots, but I just felt it was important to see the whole message