2019 12v source to tap into

[Wowwwww]

I’ve been trying to locate a wire in the passenger side to tap into for a box to start up upon ignition source of the truck. I have had no luck on the web trying to locate a reliable source. The box has power straight from the battery, and another 16AWG wire that needs to be connected to ignition source. Any guidance would be greatly appreciated.

[davester]

You might try here: https://www.gmupfitter.com/pdflists/view/43

 

Note, I haven't actually gone through the pdfs to see if what you need is there.