How do you supply power to an iphone aux/video cord in your car?

I have an auxiliary cord in my car that is connected to a system or what not and it plays music and, when I am parked, videos. Unfortunately, it does not charge my iPhone when it is connected. Is there any way to possibly connect it or redirect it to where it actually charges my phone? The brand is iSimple.... show more I have an auxiliary cord in my car that is connected to a system or what not and it plays music and, when I am parked, videos. Unfortunately, it does not charge my iPhone when it is connected. Is there any way to possibly connect it or redirect it to where it actually charges my phone? The brand is iSimple.
Please let me know if you have any clue as to how I can connect it so it supplies power.
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