I have an old 94 vf2 b. I just replaced the x motor and x card and cable. That is all working fine. Kept getting ground fault alarm on tool change. Disconnected shuttle motor and it didn't alarm. Replaced with new one and getting the same result. Could it be any thing to do with parameters? Or limit switch? I swapped relays and same thing. Can't see any fried resistors on the board either.