Sigh. You and I seem to have very different vocabularies. What's the difference between a schematic and a diagram?
If we really are going to squibble on words, there is in a 912/914 no "power supply wiring external to the engine driven part" and those ARE your words literally copied.
That said: yes, the Ducati electronics must be rather complicated, certainly more complicated than an electro-mechanical conception of a hundred years old, give or take. And as I already said, they have a poor reputation regarding reliability. But I heard nothing wrong about the connectors, they look like the watertight connector blocks one finds under every contemporary car's engine hood.