Solid State Voltage Regulator, 72 Eldo

[Furbo]

Has only 3 wires....where do they hook to as opposed to the old mechanical units?

[Antietam Classic Cycle]

http://thisoldtractor.com/moto_guzzi_loopframe_voltage_regulator_cross-references_-_bosch_electronic.html

Terminal 61 isn't used.

[Kiwi_Roy]

Has only 3 wires....where do they hook to as opposed to the old mechanical units?

Don't forget the ground, there are 4 connections.