The harness will have some thicker gauge wires that are twisted together. One of the wires per twister pair is going to be brown with a stripe of some kind.
If you want an easy way to distinguish, 1. There's a diagram on the top of the radio IIRC, 2. buy a 70-9003 from a local shop and check pin locations, or 3. http://crutchfield.custhelp.com/app/...cGZVRGozM2w%3D




