Go back to a 25 ohm resistor. If you are sure your old resistor has the correct ohm reading,put it back in and see if it works.
Does this tractor have an ignition resistor between the switch and coil? If you are running 12 volts directly to the coil without any resistor a 25 ohm resister should work without any problems. That is the system that IH used on their diesel tractors when using a 10SI alternator. Many of the tractors with gas engines used a diode instead of the resistor. If yours will not work with the correct resistor you could switch a diode.
One other possibility is that the brushes are getting worn in the alternator. If the alternator uses sliding brushes rather than swinging brushes you may have a situation when a brush was hung up enough to cause a poor connection to the slip ring. That could make it not charge. Removing the alternator from the tractor and taking it to be tested may have causes the brush to come free and allow the alternator to begin charging once again.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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