It seems strange that a wiring harness could be damaged from stray welding current. I could see if the harness itself became the ground for the weld current... Highly unlikely.
Or if the lift were being showered with hot weld splatter that could land on a harness, burn through, short something out... More likely.
But disconnecting the battery would have no bearing on either. Disconnecting the battery would prevent immediate damage to a circuit board if the harness were shorted, but as soon as the battery were reconnected, the damage would still occur.
Guess I've been lucky, never damaged any electrical components by welding near them. I did set a forklift on fire once, welding sparks went down inside where the nasty oily stuff was. I caught it before any damage though.
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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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