The only other thing I can suggest is to check the fuses. I've never worked on this radio model, but I can tell you that different models operate differently relative to blown fuses. There's typically two fused circuits. One comes from the ignition switch to turn the radio on, and one is for the station presets and clock memory. Fuse 14 is live all the time, so that would be the memory circuit.
With almost all radio models, you must have the switched 12 volts from the ignition switch for the radio to turn on. It's when the memory fuse is blown that the differences show up. Some radios will be totally dead. Some will turn on and appear to tune to different stations, but there will be no sound. Others will play normally, but when the radio's switch or the ignition switch is turned off, then back on, the clock will revert to 12:00 and the station presets will revert to those programmed in at the factory. There are also some common radios used at least through the 2003 model year that will play just fine, and maintain the station presets, even though the clock still goes back to 12:00. You'll find that model will still be on the last station after the battery is reconnected. I have one of those in my daily driver, '94 Grand Voyager. There are similar radio models with the rounded face for '96 and newer car models.
It is common for multiple fuses to blow when reconnecting the battery. That's due to the current surges from the computer memory circuits charging up, and doesn't indicate there's a problem.
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Sunday, January 3rd, 2021 AT 3:01 PM