Converter gets 120V AC power when RV is plugged in to shore/generator power.
It converts 120V AC to 12V DC to charge battery and provide 12V DC system (battery supplies when not plugged into AC power)
Converter can be fed via a circuit breaker or being plugged into an outlet.
So does converter have AC power?
If it has AC power then check if DC power off converter bus bars is 13.2V minimum. If less than that converter is NOT functioning correctly.
Also.....with battery fully charged does it supply DC system when NOT connected to AC shore power?
IF fully charged but no DC power (lights etc.) then fuse/circuit breaker near battery bad OR converter 'Reverse Polarity' Fuses blown (also will not allow charging of battery if blown)
