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How do i stop interference?

I have just fitted a dvd/cd/radio in my pick up and the back speakers are picking up some interference from the enine how do i stop it.
Reece, December 2006
sounds like alternator needs suppressing to me.

bri, January 2007
its a whistling type of noise, but it gets louder as the engine runs faster??

Reece, December 2006
what kind of noise is it?

mike, December 2006