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 - Updatin The Charging System of Your Older Tractor - by Tyler Woods. Older tractors have externally regulated generators or externally regulated alternators, in some instances. That means there is one device that turns energy from the fan belt into electrical energy,
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