These are "custom" Bose units sold to RV manufacturers. The rocker switch controls the power amp which is probably hidden in the front cabinet near the door. The amps have fuses and they can also simply go bad, as ours did. Bose will repair the amp for a few hundred dollars. I decided that I wanted a modern digital audio system with HDMI inputs so I didn't bother to get it repaired. I installed a Sony soundbar system that cost less than the Bose repair.
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Joel (AKA docj)--
RV Technology Specialist
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