rewiring engine bay, question on diagram

I've mentioned in another post before why I was doing this; bad wires, broken wires, wires that lead to nowhere, bad routing of wires. And some cooked wires. Alternator is shot.

I've been studying old wiring diagrams for the car, and making my own diagram of the existing wires as I pull them out and inspect them one by one. It's amazing how many times a wire can change colors underneath the electrical tape, no wonder why I had problems.

Anyway, I have a free connector with two wires leading to the bulkhead harness. Here's the diagram: http://i.imgur.com/RwiCFgE.jpg

One wire appears to go to the windshield washer motor, plug 'D' (even though the wire color doesn't match). This makes sense since that is no longer in the car. But plug 'A' shows no wire attached in the diagram, much less for shared connector for these two wires. Could I just have had a different washer motor than what was shown in this diagram? It does say a '73 Valiant and I have a '73 Duster. I assumed (please don't beat me for that!) they would be identical.