Unless I have the wrong idea of the wheel arrangement, I can't see why there would be a difference of potential between truck & frame, when there is another truck making the connection. I would not try another board, even with a fuse, as there;s too much risk. If you think the board is bad, I'd recommend sending it to GGG to check it out on his test device. In fact, it might be worth to ship the whole engine to him to find the fault.
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