Would that 89 dodge happen to be a Shelby CSX-VNT? I just picked up this 87 Shelby CSX.
Unfortunately I can't answer your question as i'm still noob, but hopefully someone with experience can help. Post the make and model number of the alternator and i'll ask around on the turbo dodge forums to see if anyone has dissambled one. Or you can ask around on
www.turbododge.com and
www.turbo-mopar.com