hello welcome to the site.
the brake light fuse is in the under dash fuse box. fuse # 9
let me know what you find
ok you most likely have a failed brake light switch.
can you tell me if your truck has cruise control ?
is this a 4x4?
hmm my information show only 2 wires.
see the attached image for wire colors
most likely cause is the brake light switch.
Technician
have lots of general auto exp in all cars over 24 yeas in this profession