Yellow wires are your 12V. If all you have done is something with the green wire then try and undo it. I went through the wiring on mine not long ago and I think I recall the same on mine. I unplugged a wire that I thought went nowhere. I'm sure it only resulted in the kill switch not working until I earthed it again. I think..
www.gasgasmotos.es - download the manual for your year and pull up the wiring diagram. It helps!