So first of all my wiring is hard wired to the BCM under the steering wheel. I cut the wires needing to be hard wired then just plug the plug into the mirror harness for power adjust and defrost like the factory mirrors did. The wires you have the cut are:
Orange- Amber lights
Yellow- Reverse LEDS
Red/Blue- Turn Signals
Also on the mirror plug you have to connect a ground wire as the mirrors have two grounds but our truck has one. I just simply tapped the extra one to the one our truck is wired for which is PIN 11. The second one is PIN 5 so I cut and tapped PIN 5 into PIN 11.
As for connecting the wires I used these taps that made removing the wires easy in case I ever needed to remove or replace the mirrors. Once I connected the wires on the mirror side I ran them through the door into the cab to the BCM. Which I then connected the wires to the following:
Reverse Lights- Light Blue/ Brown wire, Pin 26, Brown plug
Left Signal- Blue/White wire, Pin 2, Brown Plug
Right Signal- Green/Purple wire, Pin 3, Black Plug
Ambers- Pin 22, White 26 Pin Plug