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High pitched squeal after new aftermarket HU

8K views 1 reply 2 participants last post by  Ultimagic5 
#1 ·
So I’m actually posting this for a friends car that I’m working on. He has a 2006 Chrysler 300 C with Boston acoustics and replaced his factory head unit with a touchscreen Pioneer unit. He also has a aftermarket alarm system in the vehicle and since they put the head unit in, shortly after it started making a high-pitched noise through the speakers periodically. It seems to happen with bumps more than anything, they told him that it was the amplifier that was bad. But, I just put an amplifier in from the scrap yard and still has the same problem.. Obviously in my mind it’s a loose ground wire or something that is touching a power wire, but I didn’t install any of it so I don’t know where to look. Does anybody have any ideas of a possible culprit? I’m sure he’s not the Forest to have this issue. Thanks for any help!
 
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