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Your 6 Disc HU should have an AUX button. If it does, the extra connector on the back of the HU was for the DVD system.
On the truck's stereo wiring harness, there will also be an unused connector taped to the bundle. Most often, this was for the Audiophile sub-woofer (you'll find the other end of that cable under your seat). I've also found a connector taped to the side of the stereo harness on some trucks for the DVD system.
There will not be any RCA or head phone inputs on the rear of your HU. You can hook up an Ipod to the AUX input using a FRD04-AUX adapter (about $90).
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