I have a 96 s10 blazer 4wd I was driving about 30 to 40 miles an hour with no ac no heat nothing just the radio and my headlights. As I was driving I turned on the heat because I was tired of shaking and my cluster started freaking out and almost turned off before I turned the heat off. I waited a good mile or two and tried again and boom everything was off... Ignition wouldn't click, lights wouldn't come on, it completely killed the battery. I got it jumped and it's been running fine ever since. I got everything checked and I have a good alternator, battery and starter. I've never had this problem before I've used the heat and ac plenty of times with no battery problems. Does anybody have a clue of what I can start looking for? I was thinking maybe a short but I wanted a second opinion before I started tearing my car apart looking for a faulty wire.

 

check you battery connections