I agree, there isn't any collection of all wiring diagrams for all boats & years anywhere. Manufacturer probably makes or has made, a bunch of wiring harnesses for each year, then they move on.
They prefer you go to a dealer for issues. You can try their Facebook page, they monitor that one more than this site.
This may help Marine wiring color code http://www.jamestowndistributors.com/userportal/document.do?docId=80