Posted by docmirror on August 08, 2017 at 00:11:40 from (107.213.165.255):
In Reply to: Welding on tractor posted by craig45 on August 06, 2017 at 17:19:24:
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This. It's to protect the battery from rapid over-charge and explosion. Ground plane path is hard to determine, and it's not always a single path. If you are drawing 30V at 100A that's 3000 watts. Maybe 2500 watts is going direct from the frame to the ground cable, but another 500 watts is taking a different path back to the ground cable.
I would ground the + terminal of the batt to frame and if there is a large bulk connector to the ECU feeds, I would disconnect that as well. Also keep your ground on a clean spot near the weld.
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