If I may summarize, the water heater has two separate heating elements, each controlled by its own switch.
The switch that is outside the TM is the ON-OFF switch for the electric element. See this picture in my Tech Album for its location.
http://www.trailmanorowners.com/foru...&pictureid=447
Note that this switch has nothing to do with the gas heating element. If you left this switch on, arrived at a campground, and plugged the TM into shore power before you filled the water heater, then you burned out the electric element. Fortunately, it is cheap, and relatively easy to replace
The switch that is inside, on the kitchen sink apron, turns the self-lighting gas burner on and off. It has nothing to do with the electric heating. If you turn this switch on, the red light will light, which indicates that the gas burner is trying to light. If the burner fails to light within a few seconds, then it stops trying, waits a minute, then tries again. After three tries, if there is no success, it shuts down entirely. At no point during this cycle should you smell gas. If you smell gas, there is a problem, and you must get it repaired immediately.
Bill