After reading your other post regarding hooking up your new battery. As was discovered, you had a lot of sparking when you hooked it up initially.
Find and check your converter. Many converters have fuses in them. Many have more than one.
When people hook up batteries to the wrong polarities they will often blow the inline fuse or trip a breaker on their electrical panel. Sometimes the fuse(s) in the converter will blow. This will allow for power to work normally when hooked to shore power and then not work on battery.
If your converter has two fuses and you blew one, you may have working lights but other items won't work on battery.
Just to be clear. Locate the actual converter. Not the fuse/circuit breaker panel. The converter is usually behind the panel and requires you to remove the panel from the wall so you can look behind it.
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