i am kinda puzzled too ,,, but thats easy for me to do
,, if i may ,, do u have a disconnect switch in ur tt ??? i for one don;t see why , if u have the "gensets u do" why u can't get 12 volt power ,, it one of 3 things (and others have said it ) ,, (1) ur battery is bad (2) ur converter is bad or (3) u have a serious wiring issue ,, what i would do ,, IMO is with the rv plugged in to shore power (120 Volts) take the battery leads off and with a meter (if u have one ,, or can borrow one) see what the readings are at the battery terminals (that u took off from the batteries) they should be 12 volts ,, if nothing ,, then the converter is bad ,, if u have 12 volts ,, then more cking is to be done ,, but also to re say a few things ,, ur converter will work the 12 volt stuff even with the disconnect switch off ,, while being plugged into 120 volt shore power ,,, IMO ,, i think u have a ground issue ,, but need more info