No, the converter will or should power 12 volt items and charge the battery.
The converter normally is located adjacent to the 120 volt AC power distribution panel. Next to the 120 volt AC circuit breakers maybe a small metal cover over the 12 volt DC fuses. It is possible that there could be a blown fuse if lights are not working off batteries. Many of the older ones are not that great. Newer multi-stage converters charge and maintain the batteries better.
Bud
USAF Retired
Pace Arrow
2003 Chev Ice Road Tracker