Right side wire colors.

Notes. Second one of this body style in the shop. The first is the hardest. Let me say it is STILL scary ripping off the fender trim. Broke 6 clips this time, and 0 the first time. It is STILL scary ripping off the headlight bezels. That is just how they come off! The headlights are HUGE. The lack of a Headlight Adapter from Meyer adds A LOT of time to wiring it all up. The typical GM Headlight Adapter has been plug and play since 2007, no more. The hardest part was getting to the gang plug. I had to pull the grill and headlight bezels to get the lights out, to splice. SO much time wasted. We are going backwards! NO ignition power at the fuse box in the cab, c'mon GM!!! Half the damn dash has to come out to remove the driver knee panel. The firewall is blocked with no pass through hole location. The keychain says 2022 GMC 3500HD Pro. Not sure what the pro stands for, not much apparently. Pro's want commercial accessories, and GM gives no thought or provisons to make installing them easier. Hell, the 2020 Chevy 2500 has the louvers behind the grilles!