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<blockquote data-quote="sdmtnbiker420" data-source="post: 2832133" data-attributes="member: 575292">Hey guys,&nbsp; &nbsp; I had alternator whine with my newly installed 4 channel amp and Pioneer 6900-UB&nbsp; &nbsp; (both installed at the same time).The amps are grounded under the back seat,&nbsp; while the Pioneer deck is using the negative in the OEM harness (1999 Pathfinder),&nbsp;&nbsp; which leads me to my first question - Should I eliminate the OEM ground?&nbsp; &nbsp;&nbsp; Is it OK to disconnect the OEM ground,&nbsp; and ground the Pioneer to the metal bracketry in the dash?&nbsp; &nbsp; &nbsp; Could this possibly help solve my ground loop problem?The problem was eliminated by installing an inline PAC &quot;ground loop isolator&quot; on the RCA&#039;s of my rear co-axials.&nbsp; &nbsp; There is absolutely no more alternator whine.&nbsp; &nbsp;&nbsp; What are the effects on sound quality with this device?&nbsp; &nbsp; &nbsp;&nbsp; Is this a &quot;filter&quot; or does it just eliminate the ground at that point?I have not even tried installing on the front component RCA&#039;s - I was much too happy after discovering the PAC ground loop isolator worked,&nbsp;&nbsp; (at least temporarily)&nbsp;&nbsp; that I did not want to mess with it anymore.&nbsp; &nbsp; &nbsp;&nbsp; I do not know what the effects would be,&nbsp; but i&#039;m guessing it would be the same.&nbsp; &nbsp; &nbsp; I would rather have this &quot;filter&quot; on my rear fill rather than my front soundstage.Your opinions and insight are greatly appreciated,&nbsp; thanks in advance.-SD</blockquote>

[QUOTE="sdmtnbiker420, post: 2832133, member: 575292"] Hey guys, I had alternator whine with my newly installed 4 channel amp and Pioneer 6900-UB (both installed at the same time). The amps are grounded under the back seat, while the Pioneer deck is using the negative in the OEM harness (1999 Pathfinder), which leads me to my first question - Should I eliminate the OEM ground? Is it OK to disconnect the OEM ground, and ground the Pioneer to the metal bracketry in the dash? Could this possibly help solve my ground loop problem? The problem was eliminated by installing an inline PAC "ground loop isolator" on the RCA's of my rear co-axials. There is absolutely no more alternator whine. What are the effects on sound quality with this device? Is this a "filter" or does it just eliminate the ground at that point? I have not even tried installing on the front component RCA's - I was much too happy after discovering the PAC ground loop isolator worked, (at least temporarily) that I did not want to mess with it anymore. I do not know what the effects would be, but i'm guessing it would be the same. I would rather have this "filter" on my rear fill rather than my front soundstage. Your opinions and insight are greatly appreciated, thanks in advance. -SD [/QUOTE]

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