Thanks for that,had a look tonight at my welder and think the relay is located on the pcb but theirs two relays on their and the lower one looks like it may be my problem,on the forum you sent a link for you see a few replys on someone has put a picture a of a pcb and you see a clear relay at the top and at the bottom of the picture you see the edge of the one i am thinking is faulty and want to comfirm this is for the wire live cheers mikeHave a look here, i posted up all the pages from the minimig 180c manual,
By the way, welcome
Hi dave,Main contactor that controls welding output, is located in the area beneath the wirefeed mechanism, just in front of the main transformer - remove the smaller side panel for access and you'll see a mass of wires going to/from it. Normally, when the trigger is pressed, the control PCB send a voltage to this, it energises (with a solid clunk) feeding power to the transformer. As it is controlled by a relay on the PCB (can't remember which), a fault here may cause it to energise as soon as the machine is powered up. If this is the case, you really need the PCB looked at by an expert. It may also be physically stuck in the ON position. Rare but not impossible with a very dirty machine. Worth looking at the relays, as if the one controlling the contactor has welded its contact shut, replacement may solve the problem. Otherwise it'll be a fairly complicated repair.