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<blockquote data-quote="helotaxi" data-source="post: 4786705" data-attributes="member: 550915">The noise is coming from the HU but isn&#039;t really a problem with the HU but rather it&#039;s ground.&nbsp; Using a heavy gauge wire ground the HU to the same point as the amps.&nbsp; This should minimize or eliminate the problem.When you moved the battery to the rear, you made the ground for the amps better and the ground for the HU worse because the amount of chassis between the battery and each of those components changed significantly.&nbsp; The single RCA plugged in isn&#039;t enough to equalize the differential but the two together are which explains the noise only when both are plugged in.I would also suggest regrounding th engine block and running a dedicated wire from the battery to the same point that you ground the block.&nbsp; That will take care of 2 of the big 3 and the + wire you took care of when you moved the battery to begin with.</blockquote>

[QUOTE="helotaxi, post: 4786705, member: 550915"] The noise is coming from the HU but isn't really a problem with the HU but rather it's ground. Using a heavy gauge wire ground the HU to the same point as the amps. This should minimize or eliminate the problem. When you moved the battery to the rear, you made the ground for the amps better and the ground for the HU worse because the amount of chassis between the battery and each of those components changed significantly. The single RCA plugged in isn't enough to equalize the differential but the two together are which explains the noise only when both are plugged in. I would also suggest regrounding th engine block and running a dedicated wire from the battery to the same point that you ground the block. That will take care of 2 of the big 3 and the + wire you took care of when you moved the battery to begin with. [/QUOTE]

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