Yes, thank you! Member rfs56trk/Fred identified that problem for me. The NOS switch is the one that is installed and wired. The check that I made today with the 1955 GM instruction and the check that I made earlier with the Ford instruction both show that what I have should work. I don't like what I find with my continuity checks, but I don't rule out operator error. I'll find out next week.
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 | 
