Sorry, no wiring diagrams that anyone knows of. Plus unless they’ve changed, you won’t be able to de-cypher the Hen Scratch on the breaker labels either.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
The best thing to buy is a "Fox & Hound" at the local Menards or Lows. This has a transmitter on one end that transmits a tone. Then with the tool you trace it to the other end. They usually cost anywhere from $50 to $100.