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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?
Arnold
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Arnold
2006 Holiday Rambler Endeavor 40 PAQ
2017 Ram 2500 Big Horn 6.4 Hemi
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.