I was setting up my esab suitcase welder, running off my Lincoln ranger, in CV mode, I was getting the settings dialed in and it was welding fine, then it started to act weird almost like it wasn't getting voltage the entire time.

This is what the "welding" looked like.

Anyway, then it started to smoke a little and stopped working.

Any ideas what's wrong?

I bought this several years ago and never really took the time to get it set up

There's a fuse, but no idea if it's blown Name:  IMG_20210615_160321458_HDR.jpg
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