I played with a multimeter last night and I am developing an idea that when the main headlight switch is off, a relay is used to put the high beam filaments of the right and left sides in series with each other to turn them on and make them half brightness. I pulled the fuse for the daytime running lights, so now I just have normal headlights only when I want them. I'll have to figure out what part is causing low voltage for my normal headlight function. It is probably a bad connection, fuse, relay, or switch somewhere.
After a lot of searching online I finally found some wiring diagrams mentioned/linked here by forum member s10dude on s10forum.com:
https://www.s10forum.com/threads/s-s.../#post-8057868
Which leads me to here:
https://drive.google.com/drive/folde...KCj02rRuAaVwlA
I had to figure out how to navigate the google drive folders, double click on them because single click doesn't work.
And I have a 1995 S/T truck service manual on order via eBay, but although it is a nice fat manual I don't know if it really has any good stuff in it. I will see when it gets here.
I wish this forum had some more activity in the S10 section.