On my 2006 the washers were supplied directly from the fresh water system. There was a small electric valve located near the washers (accessed via the ports cut in the floor under the upper helm? I think that is how I remember it.). One of the wiper switches activated it IIRC.
There was also a valve that allowed shutting water off to the washers. It was located in the ER, fwd, starboard side. To get to it I needed to remove the starboard panel that covered the fuel tank. Silly place to have a valve.
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