1972 Duster 340 M&H wiring harness

Update on brake test connector. Had to find some old notes from the 20th century.
The connector was only used to test the brake warning lamp on the assembly line. It wasn't meant to be used after it left the plant, which is the reason it's not covered in the service manuals.
If you would like to duplicate the factory test, just take a wire and plug one end into the connector and ground the other end. This will turn on the brake warning lamp. Of course the ignition switch needs to be in the on position.