in my blazer we found a random plug behind the brake pedal that doesnt plug into anything, its black and i think it has like 2 or 3 wires coming out of it. anyone have any ideas on what it plugs into?

 

Why dont you tell us what doesnt work \
- on your 1998 4x4
- besides maybe the hvac you forgot to reconnect?

You think everyone remembers what you own and what you are working on?

Fortunately, GM only used 2 or 3 electrical harness for all models in a year. The usual breakdowns are
- Utility
- S10 PU
- Bravada {occasionally}

Then options: Manual or Automatic Heater/AC