Snap On MW120 MIG Welder

Yes, I understand the wire size is not the problem at hand, It sounds as if there’s some electrical issue inside to be diagnosed. Toplscuda sounds as if he has the skills to guide you through diagnosing that issue. Hopefully you can get it going again.
That's how I'm leaning at this point.....but honestly, I'm open to suggestions up to and including dumbass operator error. LMAO