That's a simple matter of which side of the ammeter you connect all the "load" wires to. Load wires such as the ignition and lights.
If they're connected to the side that runs to the battery cable, you will see alternator/generator output. If they're connected to the side that runs to the BAT post on the alternator, you will see "net charge."
One way to test is to turn the lights on with the tractor not running. If the meter does not move, it's wired for alternator output. If the meter goes negative, it's wired for net charge.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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