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That's the Australia plug , when connected it allows for the motorbike to operate upside down . Dusty
Of course...it is the rare and elusive "PIPDICATOR PLUG" - - once activated, it solves any and all electrical and mechanical problems once and for all!!
I’m not great at reading these, but I think you can find your answer somewhere between p. 79-81. It looked to me like the instrument support plug but I could be mistaken.https://www.af1racing.com/ProdImages/st3/GU150.pdf#page5
It looks to me like an aux power supply--looks as though there are just two wires.Rich A
Hey, if you want to know something about your bike try this, it's all there---------------------------https://www.guzzitek.org/gb/ma_us_uk/1400/California1400Classic-Touring_042014_Atelier(GB).pdf
If all else fails, read the instructions.
You have to love some these responses. Evidently that plug enables my MG to do space travel.