Jaems,
It's indeed one of the late Dave Hillman diagrams I use. You say that there are some wires missing and colors are not correct. Regarding the missing, it could be that you do not have the complete diagram he made in more than 10 layers in PDF. Using the layers, you can only show the wiring for the head lights or the circuit for the battery charging circuit. Specifically for people with little experience with wiring and who are not used to read circuit diagrams, basically a good idea. I remember that there where several versions of his circuit diagram, but do not remember the differences. Do you have any idea why Dave used different colors than the P factory did?
I don't know if Dave has redrawn the diagrams or that he just blended parts of the original and assembled them in a single PDF. Reading your post, I think he did the first.
Below the same part of the diagram from the layered version I have. More complete than the previous version. So quite confusing.
I've used the 912 diagrams just a few times, therefore I didn't note the differences. I should have paid more attention to it before advising Andrew.
Otto