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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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