As I said the fuse supplies power to the ign. switch so that part of the circuit is fine it's the circuit going to the ignition system. It could be the switch. You can eliminate the switch by jumping the wire with 12v to the wire which runs to the ign. If when you jump the two which will simulate turning the switch on and if the fuse still blows it will eliminate the switch then you will trace the wire color which goes back to the ign system
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