Our battery in the RV went down this weekend and wouldn't stay up while running down the road. I checked it once back home, and with the switch in "Store", the battery puts out about 8.5 volts whet...
12.5 to 13 volts is lower than I would expect to see when being charged by the alternator or by the converter. I would expect the alternator to put out 14+ volts. The converter, depending on the converter, could be anywhere between 13.2 and 14.4 volts.
What is the voltage on the chassis battery when the RV is unplugged and the engine is running?