HELP 66 Mustang Backup light wiring under the dash.

Im finishing up a buddy's wiring in my 66 and the last set of wires I cant seem to finish is the back up light wires under the dash.
I have 3 black with a red stripe wires.
2 are coming from the back up light switch from the trans through the fire wall and the other is coming from the rear through the drivers side kick panel.
How do the 3 wires get connected???????
 
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There is a 3 way female plug, probably with nothing plugged into it on the drivers side. The wire from the trunk attaches to one side of the backup light switch, the other side of the switch plugs into the center of the 3 way. I have the same car, different engine and I can't find where the wire from the lights is. I have the other wires.. If you haven't found it, this is a good reference for wiring: