My guess is that this is the connector for the horn wire, which comes out the bottom of the steering mast. My '37, with a quality reproduction harness has that same connector. Does your horn work?
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix