That adapter will not pick up the power, you need that same cable with a power and ground wire. Then you simply wire tap the power and ground to the loose telephone power cable under the center console.
There is no difference between a Firewire and USB iPod when it comes to charging and playing with this cable. I know what you mean but it works in my car, and it will work with any 30-pin connector iPod and that includes the iPhone.
