Ok I have a 1990 s10 2dr 4wd blazer and I would like to know if anyone has any ideas as to how I can run my amp power wire Without drilling into the fire wall would be great, but will do if i have to.

 

you didnt even bother to search did you?

 

Passenger side firewall just drill to the right side of where the harness wires go through make sure to use a grommet before you fed the wire through.

 

I ran mine along the frame rail from the engine compartment. i put it in split loom and zip tied it along the way. Very easy install. I then drilled into the area under the rear seat and installed a grommet. Pulled it through and 15 minutes later i was done. It is safe and out of the way.