I'm hardwiring dvd headrests into my 04 Lincoln ls. My son hates car rides with a purple passion unless he has William watermoore to watch lol. I'm a cheap ass and picked up two rockville audio headrests brand new for 50.they didn't come with the box dealie that you plug them into in the vehicle so I'm attempting to hardwire them into my car. I pretty much got it all figured out except where should the rca parts plug into? Do I got thru my DVD player in the back for my navigation system?