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Interesting. I wonder if the military made the same mistake. Most of the trucks I have had came with the newer model alts.

The yellow connection , marked as AC, is actually an AC voltage output off the alternator. If the wire connected to it is rubbing metal or shorted somewhere I could see it causing problems. You can use this output to drive a tach. The factory tach, if installed, is not driven off this terminal...

Front terminal needs 24v applied to start the alternator making power. Otherwise it will just spin with no power generated.

2 terminals on regulator. 24v excite/regulation and ac which is an ac output and should not be used on a first gen truck. Unless you are driving a tach with it. But that's a separate discussion.

I can look tomorrow see if I have one kickin around. Most alt shops don't understand the mil alternators and don't put 24v to the regulator excite terminal when testing it.