Hi guys,

Here is a shot of what has been described to me as a GM 100 amp externally regulated alternator:

http://i39.photobucket.com/albums/e186/double_overdrive496/Alternator.jpg

What I am wondering is what type of two-pronged connector it takes. It was purchased from a vendor at a manufacturer's midway about a year ago and it can't be returned.

Bill,
It uses the 68 and earlier External regulated altenator plug, should be able to puchase one from any of the vendors.
this is what an internal regulated plug looks like (they are -- vice the external stlye like this II )
http://img.photobucket.com/albums/v108/idoxlr8/Engine/0056781-R1-021-9.jpg