"I don't know" what color." Between 70--71--72, and "different" sources of diagrams "out there" is some changing and or confusion of wire colors
I still don't know what diagram you are using. I don't have access to a 71 FACTORY diagram
The only empty spade on these switches is the "old" park light terminal. That's because when Mopar "went to" full time park lights, all they did was to move the park light wire from the park output on the switch to the TAIL light terminal, thus causing the park lights to remain lit.
They used the same switch that fit older models, thus creating an unused terminal
The only 71 diagram I have access to is the "MyMopar" diagrams
http://www.mymopar.com/downloads/1971/71ValiantA.JPG
http://www.mymopar.com/downloads/1971/71ValiantB.JPG
In the diagram which is chopped out of "B" above,
You have black at top left which is main headlight power coming in from the ammeter circuit
In the middle of the switch you have light green going out which is the hi and low beam headlight power going OUT of the switch TO the dimmer switch. THIS terminal HAS to be working if you have low beams
Top right terminal is yellow, and is the terminal which grounds when you twist the knob to the left for dome lights
The BARE terminal middle left is the old park light terminal
Middle right is pink and is tail / park / dash lamp power coming TO the switch from the fuse panel
Bottom right is dash dimmer controlled power going OUT to the instrument fuse, and then out of the fuse to the instrument lamps
Bottom left is black and is power going OUT to the park/ tail lamps