I think I figured it out. I found 3 switch covers in the console. They are labelled Fresh Water, Bilge 2, & Wsh Down. I am guessing that the 3 were options on the Champ. From what I read I was under the impression that wash down was standard but guess not. I wondered about Fresh Water but I guess that one would come with a tank. Previous owner did not believe in manuals which is kind of OK if the mfg. is still in business. I probable go to the extreme but I keep the manuals for everything I own. The PO said he did not get one for the boat or motor which I find hard to believe.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L