That's why I had problems, my wiring color is different. My towing mirrors have 2 blacks, blue green, and purple. Truck year 2003, diagrams from Dodge starts at 2004.
I've got the 2 blacks as ground and heat, and get mirror to move some but not all the directions.
What I am doing is swapping mounting base with a 2nd gen towing mirror, so I can keep the power and heat functions.