City Water Connection -Humming noise
I don't know what it could be but it can't be normal. Mine doesn't hum and all we use is city water hook ups through a Valterra adjustable regulator...
2017 JayFlight 28BHBE
2014 JayFlight Swift 264BH (Sold)
2007 GMC 2500 Sierra Classic Crew Cab LBZ Duramax / 6spd Allison