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the feed motor is always running (whether the trigger switch is plugged in or not)
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this makes it sound like its not the trigger switch, if its not plugged in there is no way the wire feed should be powered
but its possible they used some weird wiring trigger circuit. You should be able to check the trigger with an ohm meter - unplug it from the welder and ohm across the trigger switch. If the meter reads ~0, and then infinity when you press and release the trigger, then the tigger switch is ok, and the problem is inside the welder.