Do I need a wire harness If Im using an amp? Dont the speakers run into the amp and then the amp to the face via RCA?

 

Well, actually, if you're using the stock radio, you need a converter to wire the amp to the radio using an RCA cable.

If you're using an aftermarket radio, you can buy a wire harness so that you'll be able to install the aftermarket radio with ease. Then just directly wire the amp to the radio with an RCA cable.

 

yes, Jehoo is right - you need a line-out converter to convert your high-output from your stereo to low-output for your amps. However, some amps do come with the wire harness you can plug into that amp and just run the speaker wires to there. The first one is much easier. So it's not necessarily a wire harness but it's called a line-out converter. And just get an amp kit - depending how much power will determine the gauge of wire you need.