Problem solved! to try to find our why everything in the battery compartment was dead I bit the bullet and went under the motorhome to follow wires. Can't believe what I found. The heavy gauge wire that brings the converter voltage to the front of the motorhome was too short, so someone bolted on more wire and taped the joint. The bolt came apart so the wire was open. I will run new wire from the converter to the box in the engine compartment, no splices. Once I rejoined the wires everything works.
Thank you so much for your help. Not a total loss I now have a better understanding how the electrical system works in the motorhome. Learned a lot!