I checked with one of our RV tech's at work and he said he thinks the battery went dry from the AZ summer heat and was cooked afterwards. He recommended against getting a new converter at this time.
As a side note, we had a 11 year old diesel pusher at our last RV show with dead house batteries and we were unable to get the slides out. Chassis batteries were new and worked fine. Nothing I tried worked at getting the house batteries going. I finally checked the water level in the batteries and all four 6-volt were dry. I filled them with water and ran the engine for a few hours, which was enuf to get some juice into the house batteries to fire up the generator. Finally got everything charged up, slides out and lights on. It was an old tag-axle Holiday Rambler.
2014 Voltage 3600
2013 Chevy 3500 CC DRW
2011 Harley Ultra Limited 2016 RZR 900