Converter problem

Ok the converter has 13.56 volts out put with nothing connected. Now with no battery installed I reconnected the output wires and retested at the converter output terminals and I get 3.4 volts .Now when I pull the positive wire off the converter I get a voltage of 12.03 . Mind you I also have both red wires that are in the fuse panel disconnected . Now I disconnected the white wire from the converter and i get a voltage of 11.56 . All the fuses are good . This is a deck mount unit separate from the fuse panel . I ran a separate wire from the converter positive to the fuse panel and the voltages are the same as when wired normally. I believe I have a bad converter when it is put under load it won't produce enough power to run my 12v systems or charge the battery .