All you guys with this unit should be aware of a problem with them on CV using the 14 pin. The ground wire going to K in the machine is too large for the terminal and likely erratically shorting to the "B" terminal. As soon as an arc is struck, The ground line tends to charge up through the filter board. The charging tends to make the output stay on.

Simple fix by changing this line to a 16 or 18 gage wire and re-directing it to the chassis. Took 3hrs to figure this one out..