Both the converter and battery connect to the power center , Feeding DC power to the distribution buss, where each appliance loop ( lights, fridge, heater, etc.. ) have a separate inline fuse, In addition to the main fuse between the battery and the power center
If you have DC power at the power center, either because you are on shore or battery, you should be able to find 12vdc with a meter. If a single appliance is not working, start checking individual output fuses.
Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes