I am not exactly an expert on electricity. But I don't believe your problem is with the 12volt side of your converter. I believe one has nothing to do with the other, other than of course your converter is converting 110 to 12. So I would just concentrate on the 110 side of it. An open ground on the 12 volt side should not make any difference to the 110 side of it. It will be fun to see what the electrical experts on the forum come up with. It has to be a very easy fix. Say here is a thought. Do you have two GFIs on the rig? On one of the rigs I had the two gfis were on the same breaker and one of them was wired wrong which made the other one not work as well. So if you have two try disconnecting the other one and see what happens. Like I said I am no electrical expert. I only know what I know and that aint much. :-)
