Find your converter aka 120 to 14v charger
Bad batteries might have blown the fuses or tripped the circuit breaker, check your 120v circuit breakers
The breaker for the converter might be tripped
Also up front under the hatch
Look for the BCC aka battery control center
Black box approx 6" by 10" lots of wires going in
Cover pops off
Has relays and dc circuit breakers and fuses
Might have tripped the charge breaker
Assuming you have 12v power inside the RV From the charged batteries for the things that need it
It should be one of the things i listed