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What is battery voltage? Has to be above 12.5 volts. If you jump the starter solenid, the switch where the positive battery cable goes to, will it spin the engine? Have you removed spark plugs to make engine easier to turn and purge the cylinders, and check for spark at the plugs when cranking? What sort of safety switches does it have? Seat switch that will not allow start unless you are on the seat?
Fuse is in the small wire coming of the positive terminal of the starter solenoid, follow the wire direct to the fuse. If key has voltage, fuse is good. Did you check the battery voltage? It will not close the solenoid , with less than 12 volts.
last Seadoo I saw, the fuse was in the sealed electrical box, cover had to be removed t access.