If the alternator is known to be good, look at the wiring next. I assume AutoZone also tested your battery and confirmed that it was in fact still able to take and hold a charge.
You have a 1984, which is during the bad wiring harness era. Has your harness been replaced? Stuff could easily be shorting out inside the harness cover as the old insulation decays.
What is the condition of your battery cables?
What is the condition of the small blue ground wire coming off the alternator? Check integrity of the wire itself, as well as confirming that connections on both ends are clean and tight. I had one where the copper wire was broken all the way thru inside of intact insulation.
John
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