Another post? http://www.alfaowner.com/Forum/ice-a...ion-radio.html (Problem with clarion radio)
As we discussed, it's probably a faulty headunit, but very difficult for us to confirm in these forums.
You can either:
*try another stalk control
*try another patch lead
*try a another Clarion headunit
Because this can cost time and money to buy replacements, you are probably best to visit a good Clarion shop and have them test for you. We cannot help much here; an experienced shop installer needs to do the testing with a different Clarion or stalk controller.