Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This sounds like the clutch has gone bad, it is drawing too many amps when you engage it which is causing the fuse to blow.
Try unplugging the electric clutch from the wiring harness at the connector down near the clutch, then engage the mower deck and see if the fuse still blows, if it does then you have a wire shorted out somewhere coming down to the clutch, if it doesn't then the clutch is drawing too many amps or has a short in it that is causing the fuse to blow.