[dscott]

On our old harness there was a wire specifically for the brake warning light that went to the prop valve. That wire was # 156 and is blue. The 2 pins on the valve are wired together. You would need to find an original connector and splice it in to wire # 156. I've never used that circuit. I used the manual adjust prop valve and they don't have a warning switch. On a used switch the light rarely worked anyway. I always figured I would know if the brakes were failing so a red light wouldn't tell me much anyway.
Don