I want to mount a tethered magnet kill switch on the bars and need to break into the wiring. In the sheath running from the RH switch, I have 4 wires, but the colours don't match the wiring diagram. For the kill switch I should have Grey positive and Brown - White earth. In the sheath I have Blue, Brown, Blue - Yellow and Brown - Black. Anyone know which 2 are for the kill switch? Edit: TE630.