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HI my name is Robert...
Normally that lighting is supplied from the interior fuse panel, the interior fuse panel is normally with the breakers, next to the breakers you will have some fuses for the DC side, that fuse panel is almost always inside, could be under the fridge, on the outside base of the bed, in the closet or in a cabinet in the bedroom, many times you will have a finished wood panel like the rest of the cabinetry in the RV.... Let me know if you still can not find it, follow ups are included... Robert
The only other fuse box I am aware of that you will have if you do not have one in one of the bedroom cabinets is outside, click HERE
It is near the battery and inverter.