Okay, remember, this is an '05 schematic. They could have done anything with wire colors.

The hot wire will be LT GRN/RED (means light green with a red stripe). The output wire will be LT GRN. This LT GRN wire should be hot when the pedal is pushed. The LT GRN wire goes up to your multi-function switch, through normally closed contacts, and comes out as ORG/LT BLU to the right side stop light, and LT GRN/ORG to the left side stop light.

By the way, does your high mounted stop light work (on the back of the cab)? This is important, so make sure it has a good bulb and see if it works. Because that is the same wire from the brake switch, but does NOT go through the multi-function switch. So, if the HMSL works, but the rear brake lights don't, that is a strong indication that the multi-function switch is bad.

If neither HMSL or rear lights work, then it's more likely the brake pedal switch. Also, the LT GRN/RED wire should be hot at all times, even with the ignition key off.