When I was writing the original post I did have momentary brain fade and stated the tech measured amps but I meant volts.............no really I did. I have two alternators one small one to charge the chassis batteries and the large on to charge the house batteries. I don't know if the house is 12 or 24 volt, How would I determine that? There is a audible alarm and light on the dash that sounds and illuminates the moment inverter power is lost. I don't think we can rule out the possibility that #1 inverter is getting weak: ("The last time we were real close to home and when I arrived I discovered that only #1 inverter had shut down that time".). I can read house voltage through the Tech Link system. Of-course if the inverters have shut down it reads zero. As soon as I get around here this morning I'll go out and take some measurements with the volt meter.