Find the converter itself & check the fuses on the side of it. NOT in the fuse panel with all of the others. On the converter. If those are blown, it will not charge your battery. You may have to remove the power center &/or panels to access the converter.
https://www.bing.com/images/search?q...7d231f567f75o0
Note on the converter in the link, the 2 orange fuses, yours should be similar.