I don't know for sure but I think I read a post that the converters on the 6331's were located under the cook top. if it's not located there locate the fuse box and look inside whatever cabinet or compartment the fuse box is mounted in. You can also look for a grate mounted to the side of one of your cabinets. The converters generate heat and Gulfstream usually placed a grate on the cabinet so the heat can dissipate out of the space.
If the batteries are not taking a charge because of salfation the converter/charger may never switch to "float" mode. so you could have bad batteries causing this, or the batteries could be good and your charger may be over charging the batteries.
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