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The rectifiers can be checked in place with a multimeter. You should have low resistance in one direction on each of the 3 diodes and high resistance with the leads reversed. You should see opposite readings on the other diode block. The brushes are available for around $10 at most...

Just put your meter lead on the large nut to measure the alternator output voltage. If you only have +24v battery voltage the alternator isn't working. Visit Southern Automotives website, there's a full troubleshooting section there.