Two-wire Vs. Three-wired Alternator
There were also optional heavy duty alternators, some made by Chrysler and others made by Leece Neville.
Leece-Neville wiring with transistorized regulator.
Notice there are three terminals on the regulator. Power supply line J2B - Blue connection is seperate from the lead to the alternator field brush. Never seen one in real life. I did see some more info from Chrsyler but didn't bookmark or save it. woops.