If I were John, I would temporarily put a 1/2 Amp fast blow fuse in series with the 12V input to the EC-2, just to prevent the EC-2 buring up again. Remove the fuse when everything is working (any potential short or miswiring located and handled. Of course remove fuse well before any flight!!!!
Great idea, Finn.  Maybe I need 37 fuses. One for each pin :(