No experience? Go to/send to, a radio repair person.
Make sure the speaker and speaker wires are good. Try a different speaker. If it's a bad component, you won't fix it yourself with "no knowledge".
If Truckernix will accept it, send it to him. Otherwise you will spend a lot of money. Two shipping's and repair. Consider keeping it in place for looks and installing a modern hidden radio.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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