Thanks to all for your info.
I was able to determine than 110 power from the house was not enough,
I started gen and fridge finally switch to a/c . And roof air came on!!
Still have furnace problem.one of my buddies said he's sure he can figure out what issue is. the last owner was afraid to use anything that needed propane so they never cooked in it or used furnace. Shoes were not allowed inside either. They never even washed dishes in it. They had a portable sink and used BBQ I'm pretty sure Bbq was gas so...that's odd. But good for us the dolphin is super clean and we picked it up cheap. It has low miles new tires and 4 new deep cycle batteries even a new 6D under the step. So we should get many years of use to the drag strip and sand dunes. Great power from the 8.1 and Allison trans feels firm. Rides much better than the class C and sure is quieter