I guess maybe the first question: Are you sure you have an electric element? Not all units have the electric option. Our 2007 Conquest it was a $200 option. If you do have an electric element, as others said there is generally a switch somewhere inside, plus that little rocker switch inside the access panel. Again, the Conquest had a rocker switch for the propane, but the only way to turn the electric off from inside was to turn off the circuit breaker.
2011 Chevy Silverado 3500HD LT Ext Cab 4x4 Duramax/Allison, 2016 Redwood 39MB, Disc Brakes, Mor/ryde IS, GY 17.5" H tires, 5.5K Onan, Dual ACs, auto level, auto sat dish, stacked washer/dryer, residential fridge, King sleep number. Michelle & Ann