I think most would steer you to the 30 amp relay in the fuse box. I don’t have a picture, but one relay is the main power relay - there is many forum comments about this relay and google Seadoo 30 amp relay. It is a standard relay and can be purchased at an auto parts store or the Seadoo dealer.
I have never had this relay fail, but my dealer told me I should carry a spare on my ski at all times, so I do. Apparently it is common failure on newer skis.