I would try something like this.
hello all, I have an alpine head unit, it's a bit old, but it works. IT's a CDE-7858, and i am wondering if there is some sort of adapter or something i can get to hook up my ipod directly to the head unit. I have one of those radio ipod hook ups, but it sucks. not much of a tech guy, but if you could lead me in the right direction, it would be appreciated.