When I got my A100, the wiring had been butchered to all get out, and I was having major charging issues and killing batteries. I finally said screw it and went to my favorite discount auto store and snagged the alt, V.Reg, and all the wiring that I could get my hands on off of a 74 Dart or something and followed this.
http://www.imperialclub.com/Repair/Electrical/charging.htmAll because I couldn't figure what someone else had done with the wiring. It was really simple to do once I figured out what was done with mine. Since then, I'm really happy with the upgraded system.
BTW- This upgrade went from a 37 something amp to a 65+ amp alternator. More, yes, but not really streessing the wiring like say using these mega-amp units some guys are using.