One switch on my rig was a puzzle, but finally figured it out. It had a musical note symbol on it and was a factory installation. No mention of it in any of the documentation. Talking to another GT owner at a campsite he said "It switches the in-dash radio between house and chassis batteries." Sho 'nuff!
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.