Originally Posted by CJSuhr

This goes over the infinity unit that came in these trucks, but I'm pretty sure a lot will be the same. I had my old infinity unit work intermittently, and I bout another radio, and went over all the solder joints in the old one and it worked again once I was done.

https://www.allpar.com/stereo/Infinity-III/index.html


If you have a few hours and a soldering iron, just reheat all the joints that look iffy. They usually crack just because of age and vibrations.