Nice work, Captain Obvious. Thanks for your persistence in moving this forward. A few questions and comments specific to the Combination Switch:

1. I see the Horn Relay, but I don't see the Horn Switch (talking about the 'switch' that operates when the driver pushes on the horn pad)
   

2. Letters appear in some of the rows in Column 2 of the 'grid' for the Combination Switch (the letters are: A, B, D, E, F, M and P). Can you refresh my memory as to what they stand for?
   

3. As currently depicted, the Wipers show only 'OFF' and 'ON' modes, with the logic within the 'ON' mode apparently trying to do double-duty for both 'HI' and 'LO'. I think that the switch's operation might be more clear if 'ON' is replaced with discrete 'HI' and 'LO' modes. See attached schematic, per my original post in this thread back in July 2024.
   

4. As I also pointed out back in 2024, it's worth keeping in mind that the colours of the wires coming off the Combo Switch don't always match the colours of the wires to which they connect on the Vehicle harness. See below (bold-face letters are Vehicle-side, regular-face letters are Switch-side)...
   
   

Edited 10 hours ago10 hr by Namerow

Namerow, thanks for the input, and also thanks for the work you had done previously with the wiring. Your previous work helped me with the diagram that I've been working on. So for the comments above...

First, the horn. I understand the desire to have an actual switch depicted on the diagram. And in one of my earlier revisions, I actually did have one in there. But then I took it back out because I decided that I wanted to conform more closely to the original scheme depicted in the other areas of the combo switch. By that, I mean... There aren't any actual switches shown for any of the combo switch functions. Not for the headlights, the wipers... No switches for anything. Instead, "connection" is indicated by the existence of the dot. I though it would be closer to Datsun's original scheme to have a dot connection to ground when the horn is pushed.

Next, the wipers. I haven't dug into that system at all, and I'm kinda hoping that I never have to. I turned mine on and the arms move, and that's hopefully all I need to know. So, with that said... Are you confident in the switch connections you have laid out? If you are sure, I'll change the diagram to what you indicate.

As for the letters in the second column, I'm in the same boat as you... I think I knew at one point, but don't remember. I'll look into it.

And lastly, you are correct about the change of wire colors on the combo switch side of the connectors. Problem is that situation exists all over the car. They got better with that in the diagrams for the later years, but for the early cars, the colors on the diagrams are the "colors of the harness". I'm sorry, but I'm in no position to add all the connectors for all the devices that plug into connectors and indicate the wire colors on both sides of those connectors. Haha!!!

Thanks for the help!