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Jd 3010, 3020, 4010, and 4020 gas and LP came from the factory 12 volt positive ground. So long as the battery, coil, and ammeter have appropriate connections, and the operator doesn't blindly jumper, either positive or negative ground works the same. Changing requires swapping those three connections and then polarizing the generator so it puts out the correct polarity. Alternators can be had with either polarity or even no ground so they could be run either way, but alternators other than negative ground are uncommon. If you run the battery opposite of what the cables were supplied, one clamp will be loose and the other won't go on without a lot of reaming. The posts are different size to make that difficult so that the battery gets connected properly by those who can't perceive the + and - marks. The coil needs the + terminal to point to the + batteryh terminal, and the ammeter needs to be wired so it deflects - with load, and + with charge. There are only two ways to connect the ammeter. Right and backwards. Gerald J.
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