Where does the fresh water fill hose go? Did you trace it? Maybe the installers got the pipes mixed up?
2013 Ford Explorer 4WD, GVWR 6160, GCWR 10160, Max Tongue Wt 500#, Reese WD Hitch 66151
2012 Skylark 21FBV, GVWR 3500, New July 2013
N Scale Model Railroader
Family History Researcher
Former Canoe Camper & Retired Airline Pilot