You are going to have to follow the wire from the fuse and see where the power stops. In mine the wires are attached to the fuse panel with screws, that's what I would check first. Find out what other lights are on the same fuse, take out the fuse and see which lights go out. Check the wiring on the light nearest the bathroom lights, that's assuming there is no bathroom light switch. Don't forget the bathroom fan, mine is wired to the bathroom lights.