Bad Alternator??

Sure you can convert back to the original syle alternator....you can put in all sorts fo alternators. The quesiton is what wiring is left in there that will support the Chrysler type alternator and external regulator. You need to start with an appropriate schematic, and then see what is in your car. I would sugget you work here and not just take it to an 'auto electric' shop; it is hard to say what they will do to your car's wiring if you do not know what needs to be done yourself and have enough understanding to direct it.