No DC

Ted, first of all you need to figure out how your trailer is wired. Contrary to popular belief, not all trailers are wired the same. Just depends on the manufacturer. Is your converter wired directly to the 12V fuse panel? If so, and you are on shore power, then the battery and its fuses or circuit breakers have no effect on having 12V on the fuse panel. Also, where is your battery disconnect (if you have one) wired into the 12V supply? Some, like mine, only disconnect the battery. Others may disconnect all 12V from the fuse panel. Take your volt meter and check for 12V on the feed to the fuses on the 12V circuit board (if your trailer has a printed circuit board with all of the fuses on it). The feed should be large screw terminals and there should be one or two for positive and one or two for negative. If you read converter voltage there, check both sides of each fuse to see if you have positive 12V from each one to negative. If you don't have any 12V on the fuses or the feed to the panel, start tracing wires back to the converter to see where you find 12V.

Also, some trailers, like mine, run both positive and negative wires to every 12V light and appliance. In this case, the frame ground is not used as a return and would not be a cause of loss of DC.

Please post again with results after you have done some more testing and everyone here will be glad to give you some more guidance. Sorry your trip was messed up.

Ken