[s-cars] stereo upgrade

[Kurt Deschler]

My 200 had very bad ground loop feedback with an aftermarket head unit 
hooked up to the Factor Bose amplifiers. The problem turned out to be that 
I had grounded the line-level shields to the chassis ground when I 
repaired the harness (it was butchered). Removing that ground connection 
and using only the RCA grounds solved the problem for me. Depending on how 
the line-level shields on your head unit are grounded, you may also need a 
ground loop isolator.
 	-Kurt

> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of Aaron Ryba
> Sent: Thursday, March 01, 2007 8:25 PM
> To: s-car-list
> Subject: Re: [s-cars] stereo upgrade
>
>
> I am running a new alpine head unit to the stock amps and speakers through
> the stock wiring using a fabricated connector.
> The volume/gain and pop turn on problem was solved with an in-line converter
> for about $25.
> The problem I am having now is bad ground noise. I have tried grounding the
> head unit directly to the chassis but no change.
> I assume there is a bad ground in the harness somewhere for the three amps
> in the stock "BOSE" system.
> I had to piece back together the factory wiring since a previous owner had
> cannibalized the stock common ground speaker wiring to use as speaker leads.
> Has anyone had this bad ground noise problem with a new head and stock amps
> and speakers? Maybe it is just my crapped out wiring.
>
> Thanks,
> Aaron Ryba
> 95 S6 138k