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First, make sure that the battery for this engine is fully charged. If so, look on the engine. there are several fuses that could have blown and would cause this problem. If all the fuses are good. Using a multimeter, make sure that you are getting 12V on the back of the key switch on the red wire. Then on the yellow wire when you turn the key to start. If you are not getting anything to the yellow wire, the key switch is bad. If it is getting power, it is either the neutral safety switch in the controls or the starter solenoid.
Disconnect the starter from the relay and see if it still blows. If so, it could be any of the fuel injectors, or the coils, or even the EMM. Shorts in the engine are very tough to locate. Provided that there is not a short in the wiring at the switch.