I've got a bad brake light switch on my '52 3100. I ordered one and it's exactly opposite of the one on the truck. I looked a pics of the switch off a late '55-'59 and it looks like the one on my truck. I wonder if mabey mine's the wrong one mounted upside down or something?
The holes are on the left side of the brake lever and the electrical connectors are facing down. Should they be, or should they be facing up?