I'm re-wiring a 1949 chevy 1/2 ton pickup. The old wiring is so old (and painted over by the p.o.) that I can't see the colors of wires going to this part circled in orange (you can see a picture at:

http://www.picturetrail.com/gallery/view?p=999&gid=8919034&uid=4216428&members=1

Based on the wiring schematic in the shop manual, I'm guessing that is part is the headlight dimmer switch, anyone know for sure before I wire to find out?

Thanks