Just to close this out, I went to my favorite alternator shop. It took the guy less than a minute to remove the internal regulator, which is actually mounted on the outside, and show me the connections for the external regulator. These are Motorola alternators, built in France, so this may not apply to others. The regulator is held on with two screws and connects to the alternator with five spade connectors, two of which are the two connections to the brushes.
After he did the first one, I'll do the other one myself. Piece of cake, for once.
Bob