Can I hook my iPhone 4 up to my car using my charger?

So I have the charger that the part that you plug into a wall outlet I can take it off do I just take that off and plug it into my CD player and plug the other end into my phone or do I have to get a different wire?

Get a cigarette lighter charger, you should have this in your car anyways for when on the road.

Can't be done. The home (wall) charger needs 120V to work. Your vehicle only ever puts out a maximum of 14.8V.
Spend some money and get a car charger for it.
Or buy a "30 pin to USB cable" to connect it to the stereo.

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