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Radio gradually getting worse, sounds like the soldered connections inside it are coming loose. All the Delco radios are bad about this; they're not really designed to stay together in a truck that bounces around as long as ours have.I am also looking for input about the radio/cassette/equalizer not working. She said that when she first got the truck the radio worked fine and so did the clock. She never used the cassette or equalizer. Then she started running in to problems later. Had to hit the power button a few times to get it on and the same thing with other radio controls. But the clock still worked. Then she said that all of it stopped working, except for clock. Then one day, the clock stopped working. I have checked the fuse. Is good.
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Really like the info and I have bookmarked this and the link and when I get to the radio concern, when weather is nicer, I will be back here.More likely it died the all-too-common electrolytic capacitor death those old CDMs do - and yes, that's how they gradually stop working, generally the clock is last to go after staying at the same time for a while. There's a low chance of bringing it back to life by going in and replacing the caps, but tbh you're better off getting a 92-94 model CDM to replace it with as they have more updated components, and fewer electrolytic capacitors to go bad lol. Tho it would be a good idea to replace the few that ARE in there before putting it into service.
You can replace the CDM (which is next to the gas pedal) without having to replace the tape deck or head, it should work just the same (or at least it has in my various tests). You may notice better audio output from the newer version as well. How to tell the difference without opening it up? Well, part numbers are one way but a lot of the labels just fall off anymore. My way is to look at the heat sink. The older style just has a black heat sink with few fins and lots of holes through it. The newer ones are more silver with a lot more fins.
Or just look at my thread here lol https://www.gmt400.com/threads/88-94-factory-stereo-info.48716/
Oh yeah and make sure you get one that works with the 5 band equalizer lol, that isn't as obvious if you're pulling one from a junkyard truck unless the tape deck is still in there.