Wiring sub harness: Voltage regulator to main harness [Saprisa charging system]: MG# 28712500
Moto Guzzi V7 Sport, 750 S, 750 S3, 850 T, 850 T3, 850 T3 California, V1000 I-Convert, V1000 G5, 1000 SP, Le Mans, Le Mans II, Le Mans CX 100, Le Mans III, Le Mans 1000, 1000 SP III, 1000 S, California II, California III, California 1100, California Jackal, California EV, California EV Touring, California Aluminium, California Titanium, California Special, California Special Sport, California Stone-Metal, California Stone-Touring, California Classic, California Touring, and California Vintage models
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Thanks to Mathieu Prot for sending me his original wiring harness. I took these photos of it.
The MG# 28712500 part number only applies to the large plug that interfaces with the voltage regulator. It may also include the two short wires.