Congrats on all your hard work. I replaced my whole wire harness in 2022 with help from my buddy Richard Delgado. My 34 Buick 68C has 3 separate wire harness, I have all 8 of my "light switch" similar to yours working. My series has a floor foot switch that allows high/low beam ( city/country) driving per the manual. Does your have this option, think it came out in 1934.
You can also contact Gene Zdunowski @ YNC wire harness in Redlands, Ca 909-798-1498. he gave me a detailed wire diagram. They make wire harness or will sell you the wire, loom, connectors, etc.. ( I bought overstock spools of 10/12/14 gauge and built it myself )
You can DM me if you want extra details on your connections.
here is another thread that may be useful.
https://forums.aaca.org/topic/386670-looking-to-make-my-own-1933-buick-67-wiring/#comment-2445973
Cheers
Robert