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jumping the key mechanism wires. i.e. hotwiring it as a car theif would. If that fires it, then it's the key mechanism gone bad. One of the wires going into the Main relay is a 12v under "crank" key position. This supplies 12v during crank. Otherwise, you only get 12v while in "on" and when turned to "start" you will get 0v, if this wire is not being powered, hence, not having main power while spinning the starter.