My experience has been that RV's tend to be "cabled and labeled" differently. Sometimes. Even for the same year / make / model.
It's often made worse, by the fact that there are no "factory service" manuals and in nearly every case, no wiring diagrams.
Sadly, that leaves us with pretty much two options:
1 - Poke and hope (you or a RV repair "person")
2 - Make your own diagram and *KNOW* how it's wired. (this is what I did)
Option 2 is cheap, fast and good. (and folks say you can't have all 3!)
Rather than repost how I did it (and how easy it is), I'll point you in the direction:
Read this post: Entertainment Wiring Mislabeled?
Tina + Dutch and Bell, Bobo, Harley, Buddy (the dogs)
2011 F350 Lariat 4x4 DRW SuperCrew 6.7L (B&W setup w/Air Lift 5000 Ultimate)
2014 Columbus 365RL (Airflex and Voyager package)
Nights Camped 2014 - 154
, 2015 - 32, 2016 - 4