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I'm hooking up my air conditioner switch and see i have two extra connectors in the new wiring harness i installed. The purple connector came taped down to the wire harness.
If this is the dash harness, in my application the purple - purple/white wires were for the neutral safety switch on the automatic transmission shift linkage.
Purple and purple with white stripe are neutral safter switch for auto trannie. On the 71' diagram I have, the only yellow and blue wires I could find go to the wiper door relay (on the back of the Tach see photo)
Yes, the black thing you point to is the wiper relay. See the page from the AIM below.
I believe this picture is with my new harness and a new relay installed (silver cover) You can just make out the blue and yellow wire to the left side of the relay.