The 6 volt system that was original to the tractor would have been a positive ground, as in the + (positive) terminal of the battery would have been connected to the chassis or engine block. That must be reversed to use an alternator. If it wasn't reversed, the alternator is probably damaged.
Be sure the battery is connected with the - (negative) terminal to chassis before further testing or replacing the alternator.
Here is an example of the alternator wiring changes that must be made.
Also the ignition coil needs a resistor added or replaced with an internal resistor 12v coil. Wire the + side to the ignition switch, the - side to the points.
Any lights will also need to be refitted with 12v lamps.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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