I think "Does it even have one?" is the right question to ask.
I don't see one in the Minnie Winnie owner's manual, like I do in the 2014 Adventurer manual.
Got it....
Looking at the
wiring diagrams there's a view of the boost switch with a note:
used on 331KP.
Looks like the premier got it, base Minnie Winnie didn't. And yup, it's in the premier owner's Manual.
Would be a relatively easy addition. You already have the solenoid, and it's wired to ignition power. Wire's probably in the dash area already, just need the switch and a 12 volt source. Too bad Winnebago doesn't post full diagrams any more, or it'd be REALLY easy.