What Chuck described is pretty much how the switch works in my 31' Excella. I have 2 switches on the right hand wall as you open the door. The upper switch is a 2 way on mine that turns on the lights over the kitchen sink (if they are turned on there). This makes it easy when entering at night. The lower switch operates my outside over the door entrance light. I also have another switch that is on the curbside wall just before you get to the curved panels that controls the flood light on the outside of the trailer. Hope this helps you out.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system