The brake lights on my 1950 3600 refuse to work. The tail lights also did not work and crawling under the truck, I found two wire splices, crimp on butt connectors and the tail light wire was easily pulled out so I figured that was the problem with both. The wiring harness is original cloth covered stuff and is a bit on the decrepit side but the wire to the aft of the butt splices was common lamp cord. I put new 14g wire in for both and get 5v at the tail light wire but 0v for the brake with the pedal depressed. I checked the brake light switch which is a new replacement and there is 6v on both terminals with the pedal depressed. The wire that I think should be running back to the brake lights runs through the firewall by the steering column and I am guessing up to the signal stat add on directional set up which I have never used. The whole unit is bundled up and tucked under the dash and has been for the last 40 years that I have owned the truck as I have relied on hand signals for the most part. I am thinking that the problem may in the signal stat wiring somehow. Anybody have any ideas to help me figure this out?

1950 3600
1951 4400
Gazz