Does it have a positive or negative ground alternator? Most all common alternators were born negative ground but a few have been redone for positive ground.
If you switched polarity on the battery, even for a brief moment, you likely fried your alternator.
With positive ground the + post on coil goes to side of distributor. With negative ground the - side of the coil goes to distributor. On some tractors, with posts reversed they will be harder to start, but other than than the ground configuration should have no effect on starting.
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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.
... [Read Article]
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