Audio Systems: Installation of stereo, chevy blazer, hot wire

Question
I am installing a stereo in a 1995 chevy blazer and I can't find the hot wire. Can you please help

Answer
By "hot" you mean the wire that always has  12 volts regardless of the key position?  Or the one that gives  12 volts when the key is in the on position?  
Tecnically these are both "hot". One is always hot and one is switched hot.
Regardless you can use a meter to find either of these. Usually the constant  12 is fatter than the others but not always. Sorry, I don't have diagrams to know what wire is which for vehicles but I can help you find the right wires.