My first post at the forum after joining today. My girl owns a 1990 K2500 pickup and the radio does not work but did used to work when she bought the truck years ago. The clock was the last to go. The cassette player and equalizer also do not work. Checked all power and grounds and related fuses. I have seen a couple you tube videos about these going out and just requires replacement. Is there something I might be missing? As a retired tech, I like to be thorough before I shoot the parts cannon at it. Thanks for any info.