Glad Whisker could help you out. There is a outfit in Scotland that sells laminated color diagrams on e-bay. www.kojaycat.com is their website. They're about $15-$17 U.S. I have one but haven't tried using it yet so I can't vouch for the accuracy but it looks good from what I've compared to the OEM's book.
MANY MANY thanks for the post on here with the color schematics! Now that I can see this schematic, I may actually start trying to round up the wiring needed to rebuild the harness on my 75. Have located other sites where I can get all the necessary connectors....so now all I need is the time, the wire, (and of course the MONEY) to start this project. Then I can build a custom new harness for my 75, and hopefully resolve the wiring/starting issues it has!
I have copied both the diagram for the 75, and the one for my 81 as well.