I decided to renew my Unimog 416's wiring which was badly connected. I tried to do my best, finally I completed drawing. Yes, it is a customized electric diagram for my truck, but can give you some idea. Image file is 20K x 30K pixels. And highly zoomable. You can get 170 cm x 255 cm (66 inch x 100 inch) print out.
It is 78 MB jpeg image file. If you want, you can download, keep, and get print out. A gift to Unimog community, I hope it works.
Download link here. Right click and save.
And some 100% zoomed samples below: