07 bmw f650gs ignition wiring

Discussion in 'Thumpers' started by stvzan, Jan 5, 2013.

  1. stvzan

    stvzan STVZ

    Nov 24, 2007
    New Orleans
    Can anyone tell me what the mysterious 4th wire going into the ignition switch is and which terminal it should be hooked to . ? I am trying to bypass the stock ignition and transplant an aftermarket, generic keyed ignition switch,One fat wire goes to theBattery , one goes fat wire to the starter , one skinny wire powers to the tail light, but the other,skinny wire seemingly hot all the the time is a mystery and I am afraid to hook it up to the accessory terminal without knowing for certain what it leads to and where i should connect it on the three position ,NAPA, donor? switch. I can't find a wiring diagram for the ignition of my bmw f650gs and would appreciate any help . Thanks very much.