* Pioneer Engine Whine / Ground Loop Fix*

Well, I'm an Alpine CDA-9887 owner who "had" similar alternator whine issues. It ended up being the constant 12V power to the HU. Placed a pretty big noise filter on the line AND ran the wire direct to the battery. Problem solved.

When it comes to alternator whine, you really should be as methodical as you can to locate the source. There are several good links out on the net that can step you through the process. It's best to use that approach (IMHO) as when you start guessing, it can become frustrating pretty quickly.

 
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SethPhillips

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