only 2 channels on the pac cr-chy2 adapter?

so do i need this harness for replacing the basic sxt radio with an aftermarket radio? I suppose i just need to plug the 22 pin part of the harness into the car, and wire from there?
what if i unplugged the factory radio, and ran all new wires for everything?

this sounds really complicated

ok, let me rephrase that

what on the harness will i wire to my radio? i'll wire the radio to the amps, then amps directly to the speakers? or do i need to run those amp outs back into the harness?

gotcha, i see now, thanks! I really appreciate your help! so "wire the deck to the needed wires in this harness " means just the 12 volt acc. wire?

also, can i run the aplified signal from the amp into this harness?( cause the harness will distribute the wires where they go) or do i run new wires to each speaker?