Try this link. I had a similar problem. The GDL website is good cause it shows you how to test all the cruise parts. Before I went through the tests on the gdl website I actually called the guy, described the issue, and they virtually assured me it was the amp. Told me not to even bother testing the other stuff. Popped in a used amp and problem solved. You can get them used for $50 bucks shipped from
www.europeanautomotivegroup.com. That's the lowest price I found on the internet and they give you a 30 day guarantee. The first one surged a bit and they were real good about sending me another one. That one is working great.
http://www.peachparts.com/shopforu...130#post883130