George - It could be as simple as the ammeter wired is backward on the one showing discharge.
If the tractor has lights and/or battery (not magneto) ignition, with the engine stopped turn on the lights or ignition and observe which way the ammeter needle swings.
If the needle swings right (shows charge) the ammeter is wired backward. Simply swap the wires between the two ammeter posts and you'll be all set. For safety disconnect the battery ground cable before fooling with the wiring!
However if the needle swings LEFT when you do the test above it says the ammeter is working correctly - the problem then is the alternator.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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