What brand of reman alternator is autozone providing? My experience has been the "OEM" brand remans are absolute crap. One lasted a year, another barely 2k miles.

You've checked and checked and checked the cars system, the one constant remains the autozone source. The charging system is very simple on these cars. 4 alternators in a row seems crazy, but then again its 4 alternators in a row all from the same source.

Id consider changing it up. Id buy either a genuine bosch reman from PP or similar (in boh cases the solution to my bad alternators), or id pull a original alternator from a junk car and see what either do

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Every thread I read, says that a bad ground or connection will cause the alternators to keep frying......says the connector on the back of the alternator could cause the problem or a bad ground connection.....something causing the voltage to not move along....

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I've been reading the posts since my last on this thread and it occurred to me that you said you were running an aux fan hardwired.

I wonder if that aux fan is causing an overcurrent situation and frying your rectifiers (diodes) in your alternator/s.

Try running for a while with the aux fan disconnected to see if your alternator maintains functionality. Then, if you feel squirrely, reconnect it and see if the alt goes out. Not a perfect testing scenario but maybe one that will nail the root cause.

I've had bad electric motors, such as the one in a fan, cause an overcurrent draw that blew fuses and circuit beakers reliably. This could be just such a situation.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)