When I had a new radio/CD player installed the folks installing bypassed the switch entirely, using the existing wires from the switch to the back and rewiring the front speakers. They told me that to use the switch I'd have to use only 2 of the four outputs on the radio. They also toild me that simply joining the 4 outputs into 2 for the switch to split would be a BAD idea...
How did you do yours?
Nicolas
1982 300D -
http://members.xoom.com/nicodore/