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Date:         Sun, 3 Apr 2011 15:12:31 -0400
Reply-To:     Karl Ploessl <karl.ploessl@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Karl Ploessl <karl.ploessl@GMAIL.COM>
Subject:      Re: radio whine, need help
Comments: To: "Jack R." <jack007@comcast.net>
In-Reply-To:  <000c01cbf22a$ae174560$0a45d020$@net>
Content-Type: text/plain; charset=ISO-8859-1

use a "ground loop isolator" f.ex. from http://www.radioshack.com/product/index.jsp?productId=2062214

On Sun, Apr 3, 2011 at 2:12 PM, Jack R. <jack007@comcast.net> wrote: > Suggest changing the spark plugs... new resister plugs, and/or plug wires. > > Jack R. > 84 Westy Wolfie > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Alistair Bell > Sent: Friday, April 01, 2011 8:58 PM > To: vanagon@GERRY.VANAGON.COM > Subject: radio whine, need help > > A  few months ago the radio in the van has developed a whine when > engine running. You know, increasing frequency with engine speed, and > no whine at all when engine off. It's present on all inputs: tuner, > cd, aux, usb. > > Came on all of a sudden, and only on the front speakers which are > powered by separate amp and go through crossovers. > > What I have done: > > -redid all grounds, signal, and power leads to front speakers, > crossovers, and amp - no change > -swapped in another amp - no change > - tried alternate pair of rca jacked leads from head unit to amp, > straight run, not crossing power lines - no change > - new antenna and lead to head unit (old one was really bad at head > unit) - no change > - if i grounded amp directly to battery post instead of body, noise > was louder. BTW, the amp ground wires are a short run twisted trio. > > Recently the noise has become louder and worse. > > Today I pulled the alternator and: > > -pulled brush pack and cleaned connections > -pulled the noise reducing caps on alternator and cleaned connections > -removed the diagnostic plug (TDC sensor lead and plug) from alternator > -pulled distributor cap and cleaned, above and below black plastic > shield > -cleaned up edge of rotor > -cleaned all the grounding points (pivot bolt area etc) on alt body > > > these things have improved things, the whine is much quieter. > > Can anyone suggest anything else? > > thanks > > alistair >


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