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<blockquote data-quote="n2audio" data-source="post: 8702674" data-attributes="member: 540940">Here&#039;s what I would try:Make some shorting plugs -- take a pair of junk rca cables and cut them so there&#039;s just a few inches of cable.&nbsp; Strip the wires and twist the +/- together.Disconnect the signal cables at the amp and plug in your shorting plugs.&nbsp; If the noise is still there its being generated at the amp.&nbsp; If it&#039;s gone it&#039;s coming from upstream.If the noise is gone plug your rca&#039;s back into the amp and disconnect them at the source.&nbsp; Short the pin and the outer cylinder.&nbsp; If the noise is still there it&#039;s being coupled into the rca&#039;s.&nbsp; If it&#039;s gone it&#039;s coming from the source.This isn&#039;t going to solve the problem, but should at least tell you where to focus your efforts.&nbsp; And maybe if you have a defective amp.I had a bunch of alt noise in my last install as well - stock HU.&nbsp; I never eliminated it, but I made a huge improvement by doing away with my LOC and running my speaker leads directly to the rca inputs via some plugs I made.&nbsp; Amp gain was adjustable up to 8v.&nbsp; I ran at min gain, which was actually a bit higher than ideal, but worked pretty well.The 3 primary wires in your car&#039;s charging system:&nbsp; Alt output to battery, battery to chassis ground, chassis (typically firewall) to block ground.</blockquote>

[QUOTE="n2audio, post: 8702674, member: 540940"] Here's what I would try: Make some shorting plugs -- take a pair of junk rca cables and cut them so there's just a few inches of cable. Strip the wires and twist the +/- together. Disconnect the signal cables at the amp and plug in your shorting plugs. If the noise is still there its being generated at the amp. If it's gone it's coming from upstream. If the noise is gone plug your rca's back into the amp and disconnect them at the source. Short the pin and the outer cylinder. If the noise is still there it's being coupled into the rca's. If it's gone it's coming from the source. This isn't going to solve the problem, but should at least tell you where to focus your efforts. And maybe if you have a defective amp. I had a bunch of alt noise in my last install as well - stock HU. I never eliminated it, but I made a huge improvement by doing away with my LOC and running my speaker leads directly to the rca inputs via some plugs I made. Amp gain was adjustable up to 8v. I ran at min gain, which was actually a bit higher than ideal, but worked pretty well. The 3 primary wires in your car's charging system: Alt output to battery, battery to chassis ground, chassis (typically firewall) to block ground. [/QUOTE]

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