I just took out the switch. There are 11 pins and they aren't labeled 1 2 3 4 5... I can see the wires but I can't tell which pin each goes to without completely taking apart the plug. Going clockwise from 12 o'clock each pin is labeled as follows: 58R, 58L, NS, P30, NSE, 56, 57, K30, K, 31, 30, N. 12 labels but only 11 pins. I suspect that 57 might be the extra. I figured it would be easier to test for continuity in each knob position rather than voltage. I found a schematic here: http://web.mac.com/dakota/iWeb/Parts/Fuse.html
but it isn't very specific on the light switch.