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Message: <blockquote data-quote="MrLister" data-source="post: 3600938" data-attributes="member: 552497">I'm certain you didn't do the big 3 did you?  I had the loop noise for the longest time.  As soon as I upgraded the bat and alt ground wire it went away and I've spent literally days trying to figure out where it was bad from the HU grounding to amp grounding, to RCAs, etc..Just do the big-3 and you're set.  A quick test, disconnect your alt, start up the car (NOT for longer then a few secs to test out if everything works).  If you still get the noise then it's something else.  If the noise is gone then it's the alt.</blockquote>

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