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: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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