If it is a motorhome and the AC is the chassis AC, there should be a diagram available for this. Not sure where to get one but google the chassis manufacturer and look for forums dedicated to that manufacturer. I was able to get the wiring for my truck through one of those forums.
If it is an AC on the roof then the wiring for just that unit should be available. If you are looking for a diagram of the wiring for the camper, good luck with that.
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.