Skydivemark, my 31w has no breakers anywhere near the battery box either. I have crawled under and looked many times.
There is a small relay under the bed mounted to the frame. This relay has a small black reset button you can press with a pen. This fixed my problem when my battery switch did nothing ( no audible click ) and batteries would not come on. Rv is in storage so I don’t have a pic to post now. The relay is on the opposite side of frame from the fuse panel. If I recall there are three wires running to it. Maybe that will help.
__________________
|