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The most likely source of the problem is the main relay. It is located to the very rear of the hull over the jet pump housing and behind the black rectangular black box that holds the staretr relay and wiring. It is not visible because of the location.
Here is a link to a parts diagram for reference:
The relay is #6. It is the most common failure on these watercraft. There are two bolts holding it on and they can be removed with a ratchet and short extension with a 10mm socket. You cannot see the bolts so it will have to be done by feel. with the two bolts out slide the relay out and unplug the three wire connectors mounted on top of the starter relay wiring box. Install the new part.
Before I buy the part is there any way to make sure it is the relay by testing the connections?