I have an 84 t bird 5.0. Car has been having a issue with what I thought was the alternator. Car start fine first crank, runs good but slowly the lights get dimmer until eventually the car will shut off. I thought it would be the alternator. Been through 3 rebuilt alternators now from parts stores and have the same issue. I tested the alt by removing the battery cable with the car running and it shuts off (I know it can be bad for the car). I checked over all the wiring and everything seems to be in the right place. Car runs far to well until the battery dies for the wiring to be an issue. Could it be the voltage regulator or am I that unlucky with these rebuilt alternators? Or any other ideas? Pulling my hair out here.thanks in advance