Unknown Red Toggle Switch on Dashboard

I'm guessing the switch was added by a previous owner (check the wiring behind the dash to see if it is part of the factory wiring or an add-on). If so, then check your electrical connections at the rear of where the tow vehicle would attach. Chances are it has something to do with the tow... activating a brake controller would be my guess. The other guess, running a lube pump, makes sense too. Since your tow vehicle would be different that the prior owner, I'd hypothesize that your switch just applies power to an unused pin in the tow connector at the rear of your coach. What you do with that would be up to you.

Let us know what you find... many of us are curious!