Sounds to me like your batteries are dead. The furnace runs on 12V and the fridge takes 12 volts to run the control board. If those things run on the genny, that means the convertor is making 12V and those items will then work. If so, easy fix, just takes $$!
If you get the model number of your appliances and Google them online you will find manuals for everything.
Good luck!
Tim
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2002 Holiday Rambler 30RKD
2000 F250 diesel extended cab short bed
2014 Demco Autoslide 18K
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