If your lighting problem was happening while plugged into shore power, resetting that little breaker may not have completely fixed the problem. Resetting the breaker would have restored the electrical path from battery to lights. But when plugged into shore power, you should have lights, even with that breaker tripped.
So you may have a problem with the Converter. You can test this easily by switching the battery cutoff switch(es) to OFF while plugged into shore power. If no lights, you have no output from the Converter.
If you do have a Converter problem, and don't correct it, within one or two days your battery will be depleted.