Re: Stereo alternator noise

[Dog-n-Hog <woody@xxxxxxxxxxx>]

Ground loops in the RCA cable.  I.e., the shield is tied to the low side
of the signal at both ends of the RCA cable.  I don't care how expensive/good
your RCA cables are, all manufactureres seem to do this.

The purpose of the shield is to "drain" induced emf to ground.

You need to open up the RCA connector at the CD  player end, and
break the connection between shield and the low side (-) of the RCA
connector.

A good/noise-free installation results when the RCA cables are user-built,
with only one end having shield tied to the low side (preferably at the
head unit end).

Norm

WyldBil325@domain.elided wrote:

> HELP!!!!! My 1985 325e has a horrible alternator noise in the stereo. Through
> my experimentation, my conclusion is that the noise is picked up somewhere in
> the RCA cable between the CD player preamp output, and the amp in the trunk.
> The reason I know this, is that when I ran the cable out the driver's window,
> down the side of the car and into the trunk, no noise. When I brought the
> wiring back inside the car, whine, whine, whine!
> I tried running the wire under the carpet over the tranny tunnel, the driver's
> side doorsill, then the passenger side doorsill, all to no effect. I am using
> the most expensive Monster Cable I could find with the most shielding. OK
> fellow Bimmerheads, can one of you shed some light on my plight?

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