Alternator Question?

All aviation versions of the Chrysler alternator are grounded field. All they do to convert an isolated field to a grounded field is remove an insulating washer and put the screw back in. I have seen jumper wires installed on isolated field alternators to ground a terminal, but they were all homemade. Here is a picture of the very last generation of Chrysler alternator. The ground wire is part of a molded harness and the field terminals are screw on. We may never know why Chrysler decided to start grounding the alternator.