Wire Harness for Installing a New Radio into a Nissan, Altima, 2002, 2003, 2004 Stereo wire harness for installing a new Radio into a NISSAN ALTIMA 02, 03, 04 CarXtc wire harness plugs directly into a ALTIMA and the wires match up to the same wire colors on your aftermarket radio Plugs directly into your vehicle radio harness, no cutting or trying to figure out what each of the wires do. Antenna adapter is NOT needed for your NISSAN ALTIMA This car had an optional premium system (usually a Bose) that has a factory built in amp. Would recommend getting the amplified version of this harness if you have the premium system