Brian,
Not to my knowledge...the manuals for the Deere tractors pre-1992 are published in black and white print and the color of each wire (and its unique number) is shown along its length in the diagram. Here is an excerpted example:
My 2004 x495 manual does have some colored diagrams to highlight circuit function as seen here:
Note that the wire numbers and colors still appear along each length of each individual wire...
Chuck