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<blockquote data-quote="VereChronicus" data-source="post: 1759600" data-attributes="member: 565864"><p>As Helotaxi stated, it&#039;s just a thing with Pioneer head units...not saying that others don&#039;t share the same problem, but Pioneers have most definitely been known for it. If you simply ground the RCA outer portion to the same ground the head unit uses itself.....the noise should go away. So apparently some cheap components within the head units...that DIDN&#039;T use to be so cheap years ago....is going bad....some do it the second you hook them up...others do it a few weeks down the road. The last 3 vehicles I&#039;ve worked on had this exact same problem...and on the first one...where I looked to EVERY OTHER POSSIBILITY FIRST...since the head unit was &quot;brand new&quot;....took me a while to track down. I was begining to thing that my wiring was faulty and that I was no longer doing something right...when in all reality, I was doing better and better wiring on every install since the first day I started doing this crap in &#039;89. You can imagine the quasi-epiphany I thought I was having. All to come to the truth that Pioneer is just not making head units like they used to. It was a relief, however, to find that I wasn&#039;t just getting senile. Ground the ground barrel of the RCA to the same ground wire your head unit uses and it should dissappear.</p></blockquote><p></p>

[QUOTE="VereChronicus, post: 1759600, member: 565864"] As Helotaxi stated, it's just a thing with Pioneer head units...not saying that others don't share the same problem, but Pioneers have most definitely been known for it. If you simply ground the RCA outer portion to the same ground the head unit uses itself.....the noise should go away. So apparently some cheap components within the head units...that DIDN'T use to be so cheap years ago....is going bad....some do it the second you hook them up...others do it a few weeks down the road. The last 3 vehicles I've worked on had this exact same problem...and on the first one...where I looked to EVERY OTHER POSSIBILITY FIRST...since the head unit was "brand new"....took me a while to track down. I was begining to thing that my wiring was faulty and that I was no longer doing something right...when in all reality, I was doing better and better wiring on every install since the first day I started doing this crap in '89. You can imagine the quasi-epiphany I thought I was having. All to come to the truth that Pioneer is just not making head units like they used to. It was a relief, however, to find that I wasn't just getting senile. Ground the ground barrel of the RCA to the same ground wire your head unit uses and it should dissappear. [/QUOTE]

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