If "IF' you have a set of coach batteries that are bad it can stop everything, people need to understand when you are on shore power "It does not run off that for 12 volts system" it only charges the batteries! So if one or two of the batteries blow the other batteries will try and level the power between all the batteries now, so you could only have 10 or less volts, and most high need circuits (slides, leveling etc.) will stop running. They need a full 12 volts from the battery. Hope this helps you and other Happy Camping. P.S. will high need circuits it is always netter to do one at a time to stop blowing fuses and batteries up with the very high load on the system.
2010 Cedar Creek Silverback 35ts
2001 GMC 2500HD w/ Allison & 8.1