Honda CD175 Forum

I am trying to put this bike back together and I have a mystery wire. There is a brown wire coming from the AC Generator that is connected to nothing on the other end. I cannot find any other loose wires on the bike. The wiring diagram has 3 wires coming from the AC generator and my bike has 4 (pink, white, yellow and brown). The only brown wire listed on the wiring diagram is for a rear turn signal. Can anyone help me? I should also clarify that the brown wire is not from the neutral switch.