The switch inside the outside cover should be on/off switch for the electric. I have always left it on. On your inside panel, there should be a switch to turn on electric [only turn on when tank is full] and propane. On our 2005, pushed the switch up or down for electric or propane. Cannot remember which was which but a red light came on indicating propane.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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