If you look in cabinet above drivers seat you may find something like this you can see the connections tide together. You can test with a meter to check your power. The fuse you checked should be labeled. The plywood panel door will be flush with other paneling and will have 4 screws in corners.
Your switch could have a loose wire clip connection behind switch.
Congrats with your new coach many safe and happy travels.
Keep in touch with forum for any further help.
Oh by the way welcome to the Newmar forum and irv2.