While our rig is older, we just purchased it a couple years ago. I contacted NW to see about both wiring and plumbing diagrams. I tried both phone and email. The email response said, "Unfortunately we don't have any schematics available away from production. You can reach our service department through the 800 number in my email signature if you have any questions." So apparently the only schematics are used in manufacturing, but are not available to owners to diagnose and repair problems. I believe you can find some generic RV wiring diagrams with an online search, and they can be helpful in diagnosing problems. Good luck!
Ready to hit the road with our two GSDs! 2006 Arctic Fox 29V TT. Ram 3500 Tradesman crew cab w/Cummins and Aisin transmission.