Why did someone splice into this IGN. 1 lead?

These are traces from the original manual. Overlayed in Autocad from PDF then retraced in color. There is some human error that may apply by stitching the factory diagrams together.

Please use and report Any issues so I can Revise them. If you find issues, it may be that you have mid/late year Changes or have harnesses that are over 50+ years Old that have been changed and or modified that effects things. Please keep this in mind.