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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...
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.