"Owner manuals" on the Ducati "Maintenance.do" site post-2007 usually include a wiring diagram as the last page the PDF.
PDFs pre-2004 usually don't have any wiring diagram, and it's been an absolute bear finding them! If they don't have a digital service manual with the diagram I'm usually out of luck. (I've got some common ones by begging/borrowing/googling that I'd be more than happy to send you, but the vast majority of paper-only wiring diagrams are missing.)
Also, some bikes (ST4S) have glitched PDFs with two copies of the ABS wiring diagram (and no standard wiring diagram). So those ones I have to use my guess at wiring.
I am thankful Ducati is generous enough to at least host manuals past their self-stated 10-year limit. Still, I worry what will come after that.
kudos to you and your site!
Blows everything else out of the water. It's the RealOEM.com for Ducatis!