It appears the electrical converter in the motorhome is shot! The job of the converter is to take the 115 volt AC power coming into the RV and convert it to 12 volts (actually +/-13.5) to charge the batteries. A couple of weeks ago Kelly was staying at the house while I was in Victoria and heard an alarm coming from the inverter in the motorhome. She turned off the howling inverter and called me. When I got home I did a quick check and discovered the batteries were low but being slowly recharged by the solar panels which eventually got them back to 12.2 volts in spite of there being little sunshine.
A couple of days ago I finally got around to checking, (first confirming the rig was plugged in) and discovered the converter was not putting out any charging voltage. The converter is situated behind the breaker panel under the bathroom sink, not an easy spot to work in. There is no rush as I will not be using the motorhome for at least several months so I plugged in a battery charger, recharged the batteries and then exchanged the big charger for a trickle charger / battery maintainer. I will be like Scarlett O'Hara and "worry about this another day" when the weather is a little better and I feel more like contorting my body around the tiny bathroom. New converters cost between $200 and $300 and I imagine they would charge $100 to install one at the shop so If I can do it myself, the savings will pay for a nice dinner out.