It's possible they have 2 switches and both have to be on.
In my 19RD, there is a switch by the door that powers up all 4 ceiling lamps that run the length of the TT. Each fixture has it's own on/off switch.
We leave all 4 individual switches on and control the whole bank from the switch by the door.
So, make sure all the mystery lamps have their switches ON while trying various wall switches.
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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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