Quote:
Originally Posted by Skyhawk5247
What exactly is the harness? Is that the white plastic bit that all the wires connect into?
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Correct, wiring harness. There isn't a standard for them on radios so typically you'll get one with the new headunit that has their plugs on one end and loose ends on the other. In the "old days" you would cut the plug off the one in your car, then wire the dangly wires to the new plug or if you were really good, you'd pull the wires out of the new connector and rewire it directly in your car.
On most these days though, you can get a direct plug that will sit between the new harness and the old harness. You can either wire that directly to the new harness, or in most cases Crutchfield will sell you one already wired up.
You plug one end into your car wiring, and one end into the new radio wiring.