Thank you, Dan. I added that to my notes. I made some test light checks today. I think I am just confusing myself. The fuse is not popping, and the solenoid and the relay click when testing shows they should, so I will do nothing more before my test drive.
1950 GMC 100 Panel Truck, 1958 270,
3-spd Saginaw with BW OD,
3.73 12 Bolt Differential from a 1966 C10,
Front Disc Brakes
Bought it in pieces 9-1976, driving since 6-1978
Follow in the DITY 
