If you are going to rewire everything that does sound like a good idea, however i've not been able to find a wiring diagram as to what all of the wires in the 04 mean.
When I say rewire I mean bypassing ALL the factory wires. Run new power/ground to head unit and amps, antenna, new speaker wire , new RCA jacks and everything else. Just leave the factory harness and wires on the side, diconnect the amps and take them out.
One of theses days! View attachment 523162
Bringing back an old thread. I've been reading about a guy with a mach1 over on mp3car.com that called metra and indeed did get the part for the 2004 and everything seems to be working fine for him. I think the part has come out if this helps anyone.