how does a car stereo wire harness exactly work?

justaperson

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I'm a little confused on how to hook up my new stereo in my car. When i first got my car, it already had another car stereo in it(not the original stereo that came in the car) and im assuming that it already had a wire harness for the stereo in it. So im guessing that i dont need to buy another wire harness for a new stereo that i got, right?

I was wondering something, does the wire harness thats already cut and spliced in the care already, just have to go into the new stereo i got? all i would need to do is make sure the wires match the one in the new stereo's digram?

Also, whats the point of a new stereo coming with its own wires if whenever its put into a car, it needs a specific wire harness to your car?

sorry if its confusing, im just trying to write down what i exactly mean.
 
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