Kind of frustrating, eh? Not familiar with Prowlers, but would suggest that you find out if it is live (has power)--if live, the turn off breakers til you find one that kills it. That may help somewhat.
If you pull it out--if it is a regular house switch, chances are it was added after trlr was made and controls something the previous owner did; if it is the kind that has the blades and not screws, it is factory and controls something that came with the trailer.
Outside of this, don't know what to suggest.
But, welcome to the forum.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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