2020LTTB

I bolted and wired up the mirrors last night per your diagram. Worked right away and super happy with it. One issue I had was if I play with lock/unlock while driving, the mirror actually folded and would not open again (I have not done the momentary switch yet). I want to get the two lamps going... the one that faces forward and rear next. I do have the task lamp wiring. I just need to find the pin map for this mirror and re-pin it to match the same wire that powered the task lamp on my previous stock mirror. It will be my life's mission to figure out how to get that OEM switch panel mirror fold button to work. : )

Timothy, reviving an older threat here! Thank you for posting your diagram and efforts here. I have a 2020 LT Trail Boss and I was pulled over for towing my boat with the small mirrors as the CHP officer said I didn't have sufficient view behind me. I just purchased two OEM Tow mirrors with Camera and power fold for same year GMC Sierra 1500. I am going to attempt the wiring per your diagram this weekend. One question... I really want to use the mirror/window switch panel... I bought the switch with the power fold button, is there anyway to use that instead of a separate momentary switch?