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Hey guys, so I'm prepping for a road trip and I just installed a new stereo so I'm working through all the issues. I'm getting either ignition noise or alternator noise through my aux cable hookup...but it only happens when I'm charging whatever device is running music. So here's my issue:

Running Car + Phone charger + Phone + Stereo set to Aux = ignition noise.

It makes no difference if there's music playing or not, I get the noise regardless in this situation, but if I remove either the charge cable from the phone or the aux cable from the headphone jack the problem goes away. Switching phones doesn't change anything. Any thoughts?
 

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Have you tried putting a suppressor or filter on the voltage supply of the charging port?
 
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