B190 Enthusiasts

I have an 89 B190 and there are several issues I am trying to understand

The lights at the head of the overhead bed are not working. I have heard mention of a switch that operated only those lights in the area of the cabinet and the bed on the driver's side. There is a reading light in that location that might have appropriate the circuit. Does anyone have more information on a switch for the overhead bed lights in the house. I do have one switch that governs the lights in the rest of the house.

I also seem to have lost the ability to draw from the house battery. In my circuits a fuse is indicated, but I cannot find it. any clues?

There should be a panel somewhere with all of the fuses. In my 1991 it was under the couch; the top opened up and the fuses were in there. It was brown.

Also, make sure there isn't some sort of battery disconnect that became switched off.