replacing stereo head unit in a Coupe Quattro

[schulz@tif623.ed.ray.com (Peter Schulz)]

For those Coupe Quattro and 90 owners that have been hesitant to replace
the oem stereo...

I just replaced the oem head unit (Wiesbaden??) in my 1990 Coupe Quattro.  
I installed a Sony XR620 cassette receiver/cdcontroller. The installation 
was eased by using an "adapter connector" kit, which is basically a harness 
which plugs into the oem harness.  You then crimp bullet connectors to the
required wires. Armed with my Bentley wiring diagrams, I stepped into the unknown.

Observations:
o  regardless of what the radio and wiring diagrams said, the oem output for the
   amplified rear speakers must be somewhat amplified (not a pre-amp output), 
   because the leads to the rear speakers aren't shielded!!!  therefore I connected 
   the rear wires to the amplified section of the Sony, and used the fader to send 
   a stronger signal to the front speakers...

o  the rear amps for the speakers are not controlled by a remote on/off from the 
   radio.

o  there is a "remote on" for the electronic roof mounted antenna.

o  only three wires go to the rear speakers from the head unit, left rear +, -, 
   right +

The system already sounds 100& better. For the future:  add cd changer, replace 
rear speakers, add new amp, replace front
speakers...


Peter Schulz
1990 Coupe Q
schulz@ed.ray.com