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Help! Replaced stereo, now have loud thumps on power up and channel chages

Joined
Jan 21, 2001
Messages
204
Location
Philomath, Oregon
I have a 96 CE. I replaced the stereo with a Sony using a Metra wire harness to retain the Bose speakers. Everything works, but when I power up and power off the unit I get a really loud thump in all speakers. It also thumps when changing tracks on a cd, radio stations ans source modes. I tried grounding directly from the ground screw behind the passengers seat and battery. I also tried grounding the RCA plugs on the back of the stereo. I have tried an new stereo and have the same problem. Any ideas?
 

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