[Peter]

If you are sure you have power and you hear no click-nothing, it may be your switch going bad. First verify you have power coming into the switch. If so, you can try and hotwire her, so that you get power straight to the starter solenoid. I don't have a GTJ1300 wiring diagram, so I can not tell you which colors of wire to connect, but basically you connect the hot wire to the wire going to the starter...and see if she turns over then. If not, I would suspect your starter solenoid. Others may have better suggestions for trouble shooting this