update on alternator noise over speakers

[Perry, Chris]

These types of noises can also be caused by "multiple" ground paths.  I had
the same problems when I installed a Sony head unit into my cars (86 4ks and
89 90q).   I realize that the car is basically all one piece and that you
should be able to ground the amp in the trunk and the head in the front and
be OK.  I have found, however, that I get the best results when the
components are grounded at the same point physically.  

You might try these two things (separately):  
1. Unplug the antenna lead from the head unit.  Put a tape or a CD
(whichever you have) in and play it.  I will bet the noise is gone.  
2. With the antenna lead back in, unplug the ground for the head unit (the
one from the back of the head unit).  Again I will bet the noise is gone.

I have run certain head units without the ground hooked at all (DISCLAIMER:
This is _personal_ experience Your Mileage May Vary).  The head unit will
get ground from both the antenna and the RCA connectors from your amp. I
don't know how it would work long-term in high power applications (> 20
watts/channel).

In my current car, the 90q, the rear speakers are amplified.  The ground
wire for these runs back up into the dash so I grounded it to the chassis of
the head unit. No buzzing

I hope this gives you a few other options to check out.  I know I could not
stand the buzzing in my ears.

Chris Perry

-----Original Message-----
From: Tim Sidders [mailto:tpsidders1 at netzero.net]
Subject: Re: update on alternator noise over speakers



I have disconnected the RCA's, and the noise goes away....These are $40.00
Rockford Fosgate cables which are supposed to be very good. I guess this is
telling me that the problem lies in the RCA's, maybe if I move the remote
turn-on so it doesn't run along the RCA's this may solve my problem.....