Brake lights not work on 1991 Dodge Ram Van B250

Where can I find the brake pedal switch? Replaced both bulbs, and the fuse looks ok. Trying to find a wiring diagram?

The brake light switch is underneath the dash on or near the brake pedal lever.
1 more answer
switch is behind the pedal under the dash little plastic thing with a push button that the peddle presses in when you apply the brake