Be sure to check the fuses associated with REVERSE POLARITY - might be all that is wrong with your converter. Usually one hooks up the batteries in reverse which blows those two large fuses...
I also have a in-line fuse real close to the battery bank but the newer trailers I think have a auto reset circuit breaker there now...
We carry a 40amp smart mode BLACK and Decker VEC1093DBD just to charge our battery if we need to. A great PLAN B...
If you have ad your batteries disconnected before starting to have problems with your converter you might want to check your battery polarity. Find the words NEG or the SYMBOL '-' and make sure this is the cable going to the trailer frame ground...
Since you said you have been charging your battery by running the MH motor you are problem ok I would check anyway haha...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS