Wiper Motor Harness

OK, I have a '69 Swinger, just got out to the shop. There is another harness, it comes up from the reverse light switch in the trans, it's a BK and BK with white tracer, it plugs in to that double connector. The harness also has a third BK with white tracer that gets plugged into the Z port on the firewall connector, it should be open. The Z port on the inside of the car gets connected to your reverse lamp that is or should be at the bottom of your dash, below and to the right of the ign.
Make sense yet?
Service manual page 8-110, find Z port
Service manual page 8-112, find Z port
If you are missing the harness and lamp, Mega Parts has them in the electrical section, they're in 2 different places in that section. About $105.