How to connect an iphone to a car speaker system without a stereo?

My stereo got jacked and i want to make an amplifier to connect my iphone to my car speaker system directly.

Added (1). That won't work cause you need an amp i'm wondering if anyone knows how to make an amp from *** that you buy at radio shack or something

Take an auxiliary cord. Cut one end off. Splice the two main wires. Wire those to your speaker. Or just get a new radio.

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