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I did a search and all i could find was about amps. I just hooked up my fm modulator and it sounds great except for the engine noise. what do i need to do to eliminate it?
 

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Good grounding is the key. That usually helps. It is best when all of the componentes use the same grounding point. Last time I installed MP3 changer with FM modulator, I used amp's grounding.

What is your source? It may be where the problem originates.
 

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