mobilman44: I'm not sure I follow what you mean by turning the plug around.
Simple Mobilman44. Take the cover off the tender and unplug from the board, take the end that goes to the engine and plug into the tender board.
This may not have fixed the problem you where having, but it fixed the problem I had with the PCM Y6-b.
I have 6 BLI steamers and the used this trick a few times. Only engine I have where the plug ends are different is my BLI Class J.
Hope you don't need this tip, but you have it if you need it.
Cuda Ken