I am a retired electrical engineer, and I can probably help you. Let me know if interested.
First I would check for power (a light on the speakers for example). No light, look for a fuse (probably under the dash) also check the electrical connections I have seen these fail, especially the type that taps the wires.
Finally try another device to connect to the speakers.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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