Welcome, The furnace is 12v dc and should work on or off of shore power. Even when on shore power or gas the fridge needs 12v dc for its control board and the lights. Your A/C is all shore power. (Some need 12v dc for thermostat)
First, Check your battery. Do you have 50amp or 30amp shore power? If 50amp and plugged into 30amp that is why your A/C is probably not working. As mentioned check to see that all circuit breakers are on and reset them all just to play it safe. All of these appliances are on different circuits and the odds of them all going bad at the same time are slim.(barring a power surge or lightning)
#2, Did the furnace work when you replaced the blown fuse marked furnace?? What type of thermostat do you have??
#3, when you heard about blown fuses behind the panel they where talking about behind the fridge. Remove the access door (vent) on the outside behind the fridge. Check to see if you have 120v ac to the outlet the fridge is plugged into. There is a small black box in that compartment that contains two glass type fuses ... check them.
With several systems out it is a process of elimination to get them back.
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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