Bulkhead Supplemental Diagram: 69 Barracuda

It often helps to do your own. I've done the same with the connectors. Sometimes on computer, often on paper while looking at the real thing.

I don't know if you had seen the layered pdfs 1969383S has made and shared.
1969 Plymouth Barracuda wiring diagram (not mine)

They're based off the factory diagrams and then edited as he finds info.
I haven't used the '69 version except to occassional compare with '68 and '67