On vehicles with an alternator I would disconnect the ground. On vehicles with all this electronic garbage I would not even weld on them. With my luck if I even thought of welding on them my electronics would be messed up. On the older Tractors with a generator do not weld on them with an AC machine. You will depolarize the generator. I did that on a 57 ford truck and a 56 Allis. And I know 2 people who no longer have a working DC welder because they welded on the frame of the machine with an AC buzz box. One of those guys did get several DC batteries and hook them in series and polarize his generator. Thats my 2 cent's worth
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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