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<blockquote data-quote="Decipha" data-source="post: 1737949" data-attributes="member: 560051">wrong wrong wrong wrong!!!!!first off its not road noise, it&#039;s called alternator whine.next, pin point where its coming from.&nbsp; To do this disconnect the RCA&#039;s from the amp.&nbsp; If the noise is still there then the problem is not the HU,however,pioneers are known for bad internal grounding issues, if the rca ground didn&#039;t work, chances are the head unit has a bad ground.&nbsp; NEVER use the ground from the factory wiring harness.&nbsp; Always run the ground to a metal surface, be sure you sand it down and get a nice clean ground spot.&nbsp; If you still have the alt whine, try lowering the gain on the amp.&nbsp; If the problem still persists you can try a ground loop isolator.&nbsp; You won&#039;t have as much output but the alt whine should be gone.&nbsp; If not, you may have a damaged head unit.</blockquote>

[QUOTE="Decipha, post: 1737949, member: 560051"] wrong wrong wrong wrong!!!!! first off its not road noise, it's called alternator whine. next, pin point where its coming from. To do this disconnect the RCA's from the amp. If the noise is still there then the problem is not the HU, [B]however[/B], pioneers are known for bad internal grounding issues, if the rca ground didn't work, chances are the head unit has a bad ground. NEVER use the ground from the factory wiring harness. Always run the ground to a metal surface, be sure you sand it down and get a nice clean ground spot. If you still have the alt whine, try lowering the gain on the amp. If the problem still persists you can try a ground loop isolator. You won't have as much output but the alt whine should be gone. If not, you may have a damaged head unit. [/QUOTE]

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