GMC BRAKE LIGHT WIRING

I Replace Heater Core By R And R The Dash, Now I Found That Brake Lights Don't Work, I Found No Power To Brake Switch Then I Chase The...

Right Side Brake Light Works When It Wants. Looks Like A Short. Need Diagram And Location Of The Wiring Components. Is This Common On This...

My Turn Signals Work, The High Mounted Brake Light Works, But The Tail Light Brake Lights Do Not. I Have Replaced The Bulbs And Inspected...