I have a Miller XMT 300 cc/cv. I have used it for stick welding and a feable attempt to tig (I am not a welder, I just like to tinker in my shed/shop. I recently acquired a Miller XR with the XR-15a push pull gun that I want to connect to the XMT. The 14 pin plug from the XR is only using 4 pins, J and I for 115 volts, K for chassis ground and G for 115 volt contactor control. The XR will power on and will advance the wire but I am getting no weld. I think it is in the contactor close circuit but in reality I don't have a clue. I spoke with Jason at Miller and he was very helpfull in sending me the wiring schematic for that machine. I also have a XR-A which is a little newer but has no gun, cables or drive roller. I can take everything off the XR and put on the XR-A but I think the XR is an easy fix, maybe it is as easy as a jumper on T2 terminal strip. Any suggestions.