The wire comes out of you ignition coil. and runs up to the red button. when the red button is pressed it completes the circuit between the wire to the coil and the frame(handle bar). Sometimes the wire can get pulled out some forme the hole its is screwed into. and some of the wire may fray and be touching the handle bar causing your bike not to start due to the circuit being completed. Just a heads up for something that may happen once and a while(blue moon) i'll put it this way 2 years of riding i seen it once.