One of those unmarked switches on my trailer was to turn on and off the bedroom speakers. Until we had the sound on we would never have figured out what that switch did. Sorry, not sure on yours but it might be the same thing??
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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