When replacing your factory radio with an after-market car stereo, a wire harness is a must for a quick installation. It eliminates cutting your OE radio plug helping to maintain your cars value. After connecting it, your install is simple as the wires will color-match and easily connect to the after-market stereo. Without a wiring harness you will have to cut the factory harness and then test each wire to connect to your radio.
In addition, because you do not have to cut your OE radio plug off, using an wiring harness allows you to reinstall your factory receiver at a later time. A great example is if you sold your car, but wanted to keep your after-market radio and re-install your factory stereo receiver
This amp integration wiring harness integrates the new stereo with the factory amplifiers using the RCA plugs seen pictured. These RCA plugs will plug into your aftermarket receivers pre amp outputs. This will give you complete control over your cars stereo system and allowing you to dial in that perfect sound using the factory amplifiers.