Does anyone know what wiring goes through the firewall on a 2005 chevy trailblazer? i was installing a amp and sub and accidentally drilled through some wiring in the firewall, and now it wont start and once i get it to start it doesn't let me shift out of park. please help!

 

tons of stuff goes through the firewall. Pretty much everything connected to the in-cabin fuse block. You probably hit something ignition related. How much damage did you do? Got a pic?

 

 

That looks like a bitch to repair. Might be easier to just get another instrument panel harness.