DenaliDH

What is the diode for in the gray connector on the left?

Thanks Phil. The only reason I was going with the oem mirrors is because I am also purchasing the Intelllihaul 3 camera system and the mirror cameras replace the oem mirror bottom caps. How do I buy the mirrors and the harnesses through you?

Phil - I just found this thread after researching towing mirror upgrades. I have a 2018 Sierra Denali ultimate with the powerfold std mirrors. As I said, I want to upgrade to the OEM towing mirrors. I’m going with the oem towing mirrors as I want to also add the intellihaul 3 camera system with the mirror mounted cameras. I’ve read several threads about what I need to have all the mirror functions I have with my current mirrors work (heat, glass signals, marker lights, cargo lightspower fold, memory, and reverse tilt - I understand I will lose the puddle lights with the oem towing mirrors, correct?) and I’m even more confused. Can you tell me what part number oem mirrors I need and what door harnesses? I assume that sine I have an Denali ultimate, I have all the required wires in the car side harness? thanks in advance - your research and knowledge is amazing!