Our new 16 coachmen leprechaun 317sa few issues.

First off, you have to see what your barreries are ar with a good volmeter. What you say is very symbolic of a weak connection not charging your batteries.
When the batteries are not charged, there is not enough to fill them, even when plugged in. In my case, the negative wire off the converter was so loose, the batteries could not get charged, so things did not work. Easily checked with a voltmeter, measure right at the converter output, and then at the battery. They should read the same.