If it is KNOWN that the photo in the original post is wrong, it should be flagged as such, either remove the photo or put some BIG text in that post. From your schematic and Tin’s comment RE lugs, I would say it is wrong.
Maybe the the pic is of a 625x not the 375 ? Looking at the wiring diagram included with the 625 the terminal on the right is the work/clamp which I believe is pos and the terminal in the middle is the torch which is neg unless I am reading the wiring diagram wrong.
Mine has the ice 27 torch on it. Which sticks into the cabinet longer so there’s a little bit more wire when they move to the bigger torch it looks like it doesn’t stick into the cabinet as much and have shorter wires and it looks like they were forced to switch the terminals from 234 to 243
So the take away is dont assume a picture on the interweb is correct and double check the wiring diagram and follow the leads back from the torch plug to the terminal. My 625 has a completely diff plug for the torch than the one in your pic. I assume Miller has used a couple of vendors for these things over the past few years
I am new here. I finished installing my table, and installed THC to Miller Spectrum 375 extreme with XT Torch. I installed raw voltage following directions and some of the previous post in this forum. As many said, the wiring is different. See the pic below, I installed the black in the middle machine lugs. I tested the continuity, everything seems to be right. when I try to cut, the plasma is not firing at all. Not sure what I am doing wrong here. Appreciate any help!