Originally Posted by EdJunior
but can also be turned off (and on) at the light itself.
Yep. like EdJunior stated, if you have it turned off at the light itself, the switch does nothing...........but if you have the light turned on at the light (usually by pushing on the button), then the switch will turn the light on/off. This is handy when you are first entering the trailer and need a light quick.
My camper is just like Sideout1961's, and the switch only controls one light, which is the overhead light nearest to the door.
Try turning the switch at the panel to on, then clicking the light to on at the fixture itself. Once it is on, the switch should be able to control the on/off function..........but only if you leave the light clicked on at the light fixture.