It sounds like a converter problem. With a voltmeter, check the voltage at your batteries. It should be 13.2V or higher. If it isn't you are not getting power from the converter to charge your batteries from shore power. This can be from a bad connection, bad converter or the converters 120V breaker. If you can find your converter, check the voltage across the red and black terminals. Again it should be 13.2V or more. If it is, you have a bad connection between it and the battery. If it isn't, you need to make sure it is getting 120V AC. If not research why - it could be a circuit breaker or bad connection.