Hello. Welcome to Just Answer. Please allow me to assist you. This issue is interesting; it passes on the bench but not on the car. This tells me that the alternator is faulty. In other words, the alternator will deliver a voltage output on the bench, but, when on the car, the additional loading of the unit (ECM, spark, etc), the alternator is incapable of maintaining the necessary voltage to maintain 10.5 volts DC to operate the vehicle. In this case, I suspect a bad voltage regulator inside the alternator. The problem with aftermarket alternators is rather simple. You get what you pay for. The cheaper the alternator is, cost wise, the less new parts (and usage of quality parts) is reduced. I have had, in my years in the shop, many 'aftermarket' alternators that were inoperative right out of the box form a parts store. You would be best advised to get a quality rebuilt unit. FOr the money, and the warranty that comes with it, a replacement alternator form a Toyota dealership parts department cannot be beat. You get a 12 month, UNLIMITED mileage warranty on any part the parts dept sells. This means that they are serious about the quality and the reliability of their remanufactured parts. The recommendation I have for you on this request is to return the AUtozone alternator and get a genuine Toyota rebuilt unit.
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