 Static sound when playing radio
Hey I recently changed the stock radio with a cd player and the radio works fine. One thing is when i have the radio playing and i try to plug in my navigation or Ipod to the cigarette plug i start to get a static sound coming through the speakers. The more i give it gas the louder it gets. Its horrible because i practically work out my car and i need to have the navigation plugged in in order to get to my meetings. Its either have the navigation without listening to the radio or have the radio and not know where to go. Would like to have both working. Any ideas on what could cause this to happen? I double checked all the wiring and made sure that there was nothing exposed. Ran out of ideas. Please help Thanks | 
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