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If your 12-Volt conversion is typical, and uses a standard Delco internally-regulated alternator, there will be three connections to it... the heavy-gauge output wire connected to the insulated stud, an smaller wire from the output stud jumper over to the terminal labeled "2", and a "switched excite" wire to the #1 terminal. The wiring to the #1 terminal is likely the culprit here. The #1 terminal must be fed power while the ignition switch is on, and have NO power to it when the tractor is shut down. If it is mis-wired, and powered even at shutdown, the battery will be drained. Check with a voltmeter, or simply disconnect the wire from the #1 terminal at shutdown, leave the tractor sit for the length of time it has been taking to drain the battery, and then try to start it, to see if the current drain has been eliminated. If disconnecting the lead stops the battery drain, you need to figure out how to rewire the system correctly so power is shut off the the #1 "excite" terminal when the tractor is shut down. An "idiot light", diode or resistor is required in that lead. Post back if you need help with that. If it still drains the battery with the lead disconnected, charge the battery back up, and disconnect ALL THREE of the alternator's wires, an insulate the with a few wraps of electrical tape to eliminate the possibility of them shorting out against metal. If the battery now stays up, the alternator is bad internally. If the battery stills goes dead, you have a short somewhere else, or a bad battery.
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