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Matched and connected all the wiring in the head light bucket. This one is a mystery. Can't seem to find this configuration (one in -two out) on the wiring diagram. 1981 XS400. Any clues? Thanks
It’s a ground connection. Off the top of my head there should be enough female bullet connectors to ground left/right signals, the headlight, and I believe one side of the handlebar controls also had a separate ground.