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It should just switch over without any switches. Mine is like all RV (at least that I know of) that just turn the lights on. If you have an inverter than there maybe something different to do. If I need electric power while drycamping I just fire up the generator.
What year is your MH?
2017 Grand Design Reflection 303 RLS
1997 GMC Sierra 3500 Dually
Your question implies that things don't work correctly when your not connected to shore power since normally you don't have to do anything. If the 12 volt items only work when your connected to shore power then that's a sign that your batteries are toast, a battery fuse/breaker needs replacing or maybe a battery disconnect switch has been triggered.