12v symptoms I don't understand

Today while switching out 12v batteries my wrench momentarily shorted positive to trailer body (it sparked a little), I already had negative connected. Since then it appears that I only have 12v power to some of the fuses in the panel. For example the vent fan works but the fridge and furnace do not. Additionally, the fridge does not show any sign of life for either AC or gas operation. Did my temporary short circuit do something? I checked the two 30 amp fuses in my power converter and they are ok. If I'd blown the "short stop" breaker near the from on the trailer wouldn't I have NO power to anything? Any help appreciated.
Oh, it's a '07 Nash 22H

Thanks, Milt