Getting diagnostic work at Auto Zone is like getting brain surgery at a drug store. There's a reason that counter guy is selling discount parts instead of working in a real shop. Find yourself a real pro who can do a test of the full charging system. The few bucks you'll pay for a proper diagnosis will be worth it in the long run, eliminating the frustration factor!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!