I've been digging through this and a few others as I look to do this mod. Haven't ever wired additional stuff to a truck so this world is new to me.
My truck is a 2016 Sierra SLE. I've currently got two switches, TC and bed lights. I'm looking to upgrade to switch bank #23145158. When I popped my box I see the below: (rotated 90° counter-clockwise, so the bottom right is actually the bottom left of the box. Said another way this should be terminal 1 assuming that terminal 1 is the most bottom left terminal)
Looking at the GM upfitter bulliten (https://www.gmupfitter.com/files/media/photo/604/UI Bulletin_110h.pdf) it seems that I need #1, 4, 14, 20:
So, if I'm following this correctly. I buy the new bank, which is plug and play, then run my wires to the battery (red and black to red and black) and run my output wire (prob blue) to pin 1, 4, 14, or 20 (depending on which switch I want to operate which set of lights).
I'm gonna need to install some sort of fuse block for a more clean install. Still debating if I want to run a second battery but for the time being I can run this and upgrade to a second battery later if this ever becomes a problem.
Can someone correct me if I'm wrong here, noobie and all. Much appreciate the help!