well, it is possible you have gotten a lot of bad alternators... I have heard bad things about pep boys alternators... Maybe you would be better off calling up Steve mullins or Bill jenkins and seeing what they have to offer... Motorcraft pwns all.
98 Corolla LE 1.8L DOHC 1ZZFE
TEIN H.Tech Springs
Tokico HP series Struts
Short ram air intake
Tsudo Axel Back Exhaust
... if a jelly fish stung me.. would you pee on the wound?