do what I did, leave ALL the factory wiring and amps in place, use only the power,ground, and switched power lead from the factory harness, then run your RCA cables and a turn on lead from the aftermarket radio to the aftermarket amp, then run new speaker wire to the speakers, leaving the

OEM stuff in place so you can easily put it all back when you sell the car.

 

Yeah thats what im doing rob. Plus i dont feal like pulling all the original stuff out anyway.