Several things come to mind that could be causing your problem...
You say the electricity in the community "surged and burned up the breaker box"... I'd guess you mean the breaker box on the campground pedestal ??? Otherwise, trying to run a generator to power the trailer would seem dangerous or impossible...
Next, you say that you're "running a generator just enough to keep the battery charged"
Then you say, "after running generator the furnace, frig and hot water heater do not want to start up"
All these statements lead me to believe you have multiple issues.
First, if the surge burned up a breaker box AND the trailer was connected to that breaker box at the time, then I'd guess you also have things "burned up in the trailer"...
Next, you say that you're running a generator for limited amounts of time, "just enough to keep the battery charged" and that after turning off the generator, the furnace, frig and water heater do not want to start up".
That would lead me to believe that the generator is not adequately charging the trailer battery for some reason. I'd guess that the converter in the trailer has been damaged by the surge and is no longer charging the battery and that leads to inadequate 12 volt power when you turn off the generator, causing those items to not have enough "battery power to operate".
So, the FIRST thing you need to do is find someone who knows about RV wiring and have them check the trailer 120 VAC electrical system AND the trailer 12 VDC system for any damage. My guess is they will find the converter to be damaged and not working properly.
Next, check the trailer battery by load testing it. I'd guess that it has been completely discharged and subsequently damaged and can no longer be properly charged/will no longer accept a charge.
Finally, I'd suspect that not only is the converter damaged AND the battery damaged, but also you risk other damage to the trailer power center as well as any 120 volt appliance that was connected to the system when that "surge caused damage to the breaker box".....
With what I suspect to be your limited knowledge of electrical systems, I'd urge you to get someone qualified to assess the damage and get your trailer operational again. And, to help prevent any future damage from similar situations with the commercial power grid, I'd urge you to get an EMS (electrical Monitor System) to install between the grid and your trailer. That device will "shut down power to the trailer" if an unsafe or damaging condition occurs, protecting your trailer from being "burned up by faulty power from the grid".
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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