speaker wiring diagram

I'm trying to troubleshoot a few electrical problems (possible bad ground) and one of the places I need to start is with the speaker wiring. Would anyone have a sugesstion as to where I might find a diagram/schematic of the radio wires into the connector?

Thanks,

Haynes or Chiltons manual should have the wiring schematics.

Thanks, but I came across some sites after pages and pages of google.

Stereo:
http://www.the12volt.com/installbay/detail.asp?info=alarm&year=1998&make=Ford&model=Contour&ID=17754&type=Stereo

Cruise:
http://www.the12volt.com/installbay/detail.asp?info=alarm&year=1998&make=Ford&model=Contour&ID=17754&type=Cruise

Alarms:
http://www.the12volt.com/installbay/detail.asp?info=alarm&year=1998&make=Ford&model=Contour&ID=17754&type=Alarm