Keihin carburetor

Hello Have installed a Keihin carburetor in my 640 LC4 and I was interested in what the three-poliege cable is which goes on the left side up into the carburetor. (on the opposite side of the Beten buildenzugungen vom gasgrif) The cable is nowhere connected and my KTM dealer could not tell me for what the cable is. maybe you can help me there further. Thanks Sigi