1 - Is the ammeter indeed working? Turn on the lights or ignition with the engine off. The ammeter should show discharge. If not, replace the ammeter. Alternatively use a voltmeter connected across the battery terminals to check alternator operation (12.6 volts or less = no charge; 13 volts or more = battery is charging.)
2 - Check voltages at all 3 alternator terminals with the ign "on" and the engine stopped. You should see 12 volts at all 3. If not there's a wiring problem.
3 - Could be the alternator is spinning too slow to "turn on" the regulator. Start the engine and run it up to maximum RPM for a couple seconds. If it starts charging it will continue to do so after you slow it back down. (This is normal for the 10SI alternator.....)
4 - Verify the alternator is indeed good. With the engine running at half throttle, use a small screwdriver on the test tab inside the D-shaped hole in the rear of the alternator to ground it to the the alternator case (photo below). If the alternator now charges either the internal regulator is bad or there's a wiring problem.
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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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