hi there if you disconect the wire and the light stays on ,the wire is earthing before it gets to the neutral switch, so with a multimeter start at the bulb holder take out the bulb first and work your way to the switch, dont bother about any internal engine connection this is not your problem. could the bulb holder be earthing somehow . as seid before the bulb holder has 2 wires 1 is 12v live the other is the one to trace for a fault ie going to earth somewhere .zigzag 1985 xt600
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