How old are your batteries? They are probably toast now from being dead.. NOW with your RV plugged in take a VOM and check the terminals at the battery.. this will tell you if there is power going to the batteries..... I am betting your batteries just died of old age... or neglect..
CHARGE CONTROLER it controls the charge going into the batteries.. if you say fed 10 amps into your batteries and it did not taper off as the batteries neared full they would start to boil and would soon boil all the electrolyte off. A charge controller reduces the amperage as the batteries get near fully charged so this does not happen.
You have a '67 RV replace the converter with a new 3 stage one since the one you have is probably just a bulk charger..
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12