Where is a good place to run the power cable through the firewall to the amplifier and where did you get your remote turn on voltage from.

 

You running an aftermarket headunit? There should be a blue wire coming out of the wiring harness for the aftermarket unit, thats your remote lead.

As far as where to run the power cable.. usually there is a few rubber gometts that are in the firewall on the drivers side, sorta under where the brake master cylinder is. Push one of them out or make a hole in it to get the cable through.

After through, you'll want to zip tie itup to some of the bracing under the dash and then run it behind the drivers side kick panel (Where the dead pedal and hood release are) and then remove the door sill that runs along the door entry and run the cable under the carpet's edge all the way back. The come up in front of the rear set behind that plastic panel and then bury it around the edge of the rear seat all the way into the trunk.

 

I ended up pulling out the inner fender (03 Cobra) and running it through an unused grommet near where the door wiring harness goes through. Took a little while to find a place to run 1/0 gauge cable. I am running the factory 6 cd head unit as for the remote ant. lead from the factory harness if it is available. If not I guess I will pull it off a switched fuse from the fuse box.

 

Find a haynes manual for that model car and it will tell you what each wire on the back of the headunit is for.

What in the world kind of setup are you running that needs 1/0 guage?!

 

I located a switched 12vdc wire on the Mach 460 wiring harness and tapped into it for the amplifier turn on power. The 1/0 gauge is for a 1200watt 1ohm, 1ch Hifonics amplifier to power two Hifonics subwoofers. I can't believe how crouded the engine compartment is on the 03/04 Cobras. I have to fabricate a bracket just to have a place to mount the fuse holder under the hood. This install is on a friends car. It was a breeze to do my 07 and 89 Mustang compared to this.