1981 Chevy c10 250 inline 6

My stop lights do not work. Blinkers and tail lights do. I have a few wiring diagrams but they all show 2 wires going to my brake switch and I have 4 wires. One conector has an orange and white, the other a pink w/ black stripe and a blue. Orange and white run up into my insterment panel and the pink and blue run together till the pink connects to my fusebox and the blue wire exits. I took the switch out totay and now my blinkers do not work either