Car ate my alternator, don't know why

[my126benz]

Hi Guys

I recently replaced the engine and transmission in my 88 Celica GT convertible. The engine is a JDM 2.2 (virtually the same) instead of the 2.0 that was in the car. The transmission is an auto from a car in the junkyard. The car had been running exceptionally well for almost 900 miles. Then, a couple days ago, My batt light and brake light started coming on as I would approach higher speeds. I also noticed my volt meter pegging, indicating an overcharging alternator. Also the car would not start without a jump. Took the car first to Autozone to have the battery and alt tested. They said it checked out. Then I went to advance and they told me I had a bad battery. I went home and took the battery out and went to another AZ to turn it in (3 year free replacement from AZ) and they tested it and told me it was fine. Next I went to yet another advance and they also to me it was fine. That night I noticed that the alternator was still hot even though the car had been off for several hours. So I took the alternator out (also covered my warranty at AZ) and took it down to have it tested. It all but blew up the second they started the testing machine. Sparks and smoke etc.
So I was issued a new alternator and I installed it. The car continues to have the same problems. I took it to the AZ and the battery, starter, and alternator tested fine. When I give it some gas the volt meter says it is over charging. The car has also been off for several hours and the alternator is hot to the touch. I am about to pull the neg. battery cable.
Does anyone have any ideas on what to check next? Is there a sensor that tells the voltage regulator what to do? Is there any particular thing I should check?

Any help would be very welcomed

Thanks

[PittsburghCeli]

Check the wiring harness between the alternator and battery. Something is funny. I believe the voltage regulator is built into the alternator and the alternator has a wire going to the positive on the battery. Other than that, it sounds like they keep selling you bad alternators. Definitely sounds like the voltage regulator is bad or a diode is bad on the alternator. Just a guess but possibly a different belt configuration for the engine spinning the alternator faster hence overcharging? I think there is a another trigger wire from the ecu to tell the alternator to charge and when not to charge.
Good luck.