Don't miss out on looking at lots of links here, for tons of info, one might not expect:
The links at the top right are an opening to a vast amount of info -IF we can sort it!
Bottom of the page has some contact info which can bail us out at times.
For turing on the light, there seems to be lots of different versions of different RV, so I'll thro these in as well.
Some have a "soft spot" on the back of the lighting head to press. Some roll the dash light adjustment all the way to click.
But there may also be times when if you know where an item is located, finding it on the parts drawings can lead to a breakthrough on what and how.
This is for your RV:
Down about page 126 is the electrical front end where you might ID all those parts on the dash?
Welcome to the group!