[Shotimes] exterior/interior wiring body entry points

[Bill Murray]

This is a common belief, but it is starting to become a myth.  If you
have a large (4ga for instance) wire running from the battery to the
trunk, the voltage needs to get back to the battery, so it your device
is most likely grounded to the chassis somewhere.  This along with all
the other grounds throughout the car make the car its self one huge
source of EMI.  Therefore no matter where you run the signal cables,
you'll always be on top of a source of interference.  The only way to
avoid that is to run the wires through mid air, which isn't very
feasible or practical.  I can try and find a few write ups on this by a
top name in car stereo that is an EE.  

Bill Murray

-----Original Message-----
From: George Fourchy [mailto:krazgeo@jps.net] 
Sent: Saturday, March 13, 2004 12:16 PM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] exterior/interior wiring body entry points

On Sat, 13 Mar 2004 00:16:36 -0600, Paul Nimz wrote:

>I like to use the door sills.  Much easier to do IMHO.

Door sills are the standard routings for wire looms, factory and
aftermarket, going
from front to back.  The most important thing to remember is.....if you
have speaker
wires or source cables from CD changers or other things like that with
very small
signals....like satellite radio antennas....be sure to run them on the
opposide of
the car from any large current carrying wires, like power cables for
amplifiers. 
The alternator noise that is always in power wires will make itself
known in your
speakers, if you don't.

There are filters and other preventative measures to reduce noise, but
if all the
wires of a sound system, including power, are all run through the same
door sill,
you'll hear the noise.....especially if it is induced into the antenna.

George
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