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And the OPs boat, most definitely, does not have a direction valve. That's 100% certain.

That's really odd because G/W has never plumbed the marine heads that way. At least not in the past 20 years or so. Did you buy the boat new? That system may have been adapted by the original owner for Great Lakes use or something like that. The marine head systems have always been plumbed to go...

Then you have a plumbed porta potti, not a raw water porcelain head system. Or someone has replumbed the system. Or your boat is much older than the one we're speaking of.

There is no discharge lever that needs to be "set to overboard mode" on that system. That lever only applies to porta potties that have a macerated overboard discharge feature. The raw water head system's holding tank is plumbed for dockside discharge and overboard without any need to select one...

The whining sound is indeed normal.

Call the factory. There is a grounding block in the stern of the boat that has caused this problem before. I don't remember more of the details.

The 335 and 336 were introduced at a time when no competitors had boats that size featuring cabins. As time went by, competitors saw the opportunity to offer boats with narrower beams and fewer features at appreciably lower prices. G/W was then stuck with either a 30 foot boat that was smaller...