Help Identify Connector Under Dash

Removed Cluster to work on fan motor switch and found this connector not plugged into anything. It has four wires red with tracer and black with tracer goes to one plug dark green to the second one and brown to last one . This is 73 Duster with a/c I have looked a few wiring diagrams and don't see this connector. I have a old harness from a 72 Demon that has the same plug. It exists the harness close to wiper connections.

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