The transfer switch manages the shore power vs generator... Nothing to do with the 12v side of things (exception would be a transfer switch built into an inverter - but that wouldn't affect interior lights).
If the 12v lights, etc are not working without generator or shore power, then either the 'use/store' switch is in 'store' - typically located in the entrance stairwell area - or the 100A breaker is tripped in the battery box - flag will be out showing it is tripped.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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