Dodge: Figuring out wiring for an Infinity sound system

I'd like to put in an aftermarket CD player, but don't know how the
Infinity system is wired.

I found the amp in my LHS, but can't find the one in the Grand Voyager.

Also, anybody know if there is a wiring adapter that plugs into the OEN
harness? Seems to me you'd want to come off the Pre Outs, since it
probably wires directly to the amp. (?)