Where are you taking the voltage measurement?
The converter should be changing the batteries at around 13.6 volts or higher depending on the changing mode of the converter. If you are actually only getting 0.5V there is something definitely wrong with the converter or the connection from the converter to the battery.
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2018 Jayco 28RLS
2012 F-250 6.2L 3.73
Equalizer Hitch
Yamaha 2400ISHC
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