Wiring Random wires coming from bulkhead; any advice would be helpful

[1979GabeCJ5]

So I have this single black wire with a female bullet terminal coming from the bulkhead:


Any ideas? Got one of them laminated color schematics but it is not perfect.

The other wire or wire harness is coming the right side of bulkhead near the QuadraTrac /kickdown connector. See below:
First side of 2-wire harness

The bottom pic is the other side of the harness.

These are some of the last unknown wires I have as I would like to know what’s what so I can label everything for when I restore. Thanks in advance yall

 

[TSB8C]

Maybe this will help.

 

[1979GabeCJ5]

Maybe this will help.

View attachment 107034

Thank you!

 

[1979GabeCJ5]

Reverse lights, what am I missing?
This is the last of my wiring woes , I have seen diagrams, used harnesses for sale online , etc where there is a 2-prong/tab connector and terminal running from switch on tranny to harness in engine bay on firewall then thru bulk head and eventually to rear light . (First 2 pics)

However, (Pic 3) I have a grey/white w black tracer wire that hangs from under my dash next to a red wire that runs into the BU LT/SEATBELT Slot on the fuse panel….

What are these 2 wires for if there is already a harness/plug running from tranny to wire harness in engine bay.