I went through this a few months ago. There are some limited instructions on this web site for that pigtail connector.
http://www.hughesengines.com/Index/produ...mp;partid=27112Also, if you call Mancini, I think they will email you a pdf of more complete instructions from AR Engineering. Also, the instructions are available directly from AR Engineering.
I don't have my reference materials with me, but as best I recall run the charging wire from the big stud on the alternator to the starter relay. You should use a fuse or fusible link. I think I used a 10 or 8 gauge wire with a 14 or 12 gauge fusible link.
Run the green wire from the pigtail to the place on the MH harness where the input to the voltage reg used to be. See the diagram.
http://www.mymopar.com/downloads/1969/69BelvedereGTXSatelliteRoadRunnerB.JPGThe alternator has an internal regulator so you don't use a voltage regulator.
Run the blue wire from the pigtail to the starter relay. That I think is the sensing wire that tells the alternator how much juice to provide (and does away with the dim headlight issues).
Don't use the red wire on the pigtail.
