120VAC to 12VDC converter is not functioning.
The 120V battery isolation relay is active, then no DC to run the low volts stuff.
Pull the converter out and dig in with the DVM.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!