12V wire (Battery to Amp)

Hi everyone,

This is my 1st attempt at building a system so please bear w/me.  I'm a little confused about where exactly the wire should fit through the firewall under the dash.  I'm using a 4AWG power wire btw.  I've got a 94 Saturn SW2 and the engine compartment is very cramped so it's hard to see much of anything up against the firewall.  What sort of things should I be looking for?  Can anyone w/experience help?

Look for a flat black plug ( either hard plastic or rubber ). Pry this off and shine a light through the firewall into the car..... now go into the car and find the hole in the firewall. Pass the 4 gauge wire through the plug ( after you drilled into the plug ) and your done.

Thanks Jeff! Spent about 10 minutes today looking again and I found exactly what you were talking about kinda tucked behind something.  I appreciate your help. 

No problem. If you have any further questions post them and someone will be able to help you out