Sounds like an older unit on a frame of some sort. Has the frame been welded on since it was built. These welders were DC and if the frame was welded on with an AC welder the generator could have lost it's polarity. An old friend of mine had a Hobart welder hooked to a jeep engine. It stopped welding after he welded on the machine with an AC buzz box. He had to hook up several car batteries in series and touch the ends to two terminals in the generator. The generator was then Polarized and would weld again. I did not explain that real clear but I would bet that one of the electricians on here could make it more clear. I had a similar problem with a generator on a truck. I did some welding on the truck frame with an AC buzz box, the generator stopped working. I had the generator checked out. Fields were good armature was good, and good brushes. This shop could not fix it. I gave it to a guy that knew generators and told him what I had had done to it. The first thing he did to it was to polarize it then checked it on the bench for output, problem solved.
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