An old mate of mine has bought a near new mig/mma and wants to use it gasless. He asked me about the connections, afaik the torch wants to be neg. and the earth pos. the problem is it has three wires to the 2 terminals, I red, I black, 1 yellow which confused me, see image. He also needs to know which connections to use for MMA facility. He has tried to get info from retailer without any joy. Hope you can help, he just doesn't want to damage the machine.