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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