EMPTY TERMINAL BOTTOM OF 67 CUDA HEADLIGHT SWITCH

So, I am about to finish reinstalling the new dash Bezel on my 1967 Plymouth Barracuda.
I have become very aware that Chrysler engineers were probbaly paid to shorten every cable and wire that they could behind the dash in order to save money.
THAT...is the only thing that makes the job difficult and a PITA! Having watched a historic thread on FABO, the actual work would be no big deal otherwise.

**HOWERVER - ONE LAST CHALLENGE for me is a missing or loose wire to the connector at the bottom of the headlight switch.
I know that I removed a wire with spade connector from that blade; and I believe that it was a yellow wire.
During my work removing the old Dash Bezel, a short yellow with spade connector on each end fell from behind the dash. I was so occupied at that time that I paid no attention and threw it aside.
(Of course, now, that I am looking for it I cannot seem to find it!)

I've looked at my blown up wiring diagram and do not see that connection on the schematic. And, I've looked on the web.
I did find a 2019 thread on this forum that would lead me to believe that it would have been a ground for the headlight switch; but was not actually used in the 1967 model.
(Again probably a cost saving, when there are plenty of grounds on the dash bezel and instrument cluster already.)
67 Barracuda headlight switch wiring?

** I'd be satisfied to just know if it is a ground. As, I would not take a chance by connecting it to something else with the spade connector.
However, there is a connection block below the headlight switch that has unoccupied blade connectors for a spade.
To be safe, if that headlight switch spade is a ground, I would just create another ground to the body there....rather than take a chance.

While I was in there behind the dash, there were a lot of other small things I found to do: lube up the wiper arms; repair the rod that holds the vent control wire coil on the HVAC switches (tip was broken and control wire was popping off); reconnect the air tube to the dash vent; freshen up all the connectors that I dealt with.
BTW - I did see that there is only a air tube running to the dash vent on the driver's side - not one on the passenger side.
And I assume that the open tube is see under the dash on the passenger side is a floor heating vent.

Here is a picture of that block below the headlight switch area.


block below headlight switch.jpg