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One possibility: Static generated by the engine, most likely in the ignition system.

If the spark plug and distributor wiring hasn't been changed in several years, that's

a good possibility right there. In line filters can be purchased pretty cheaply that will take out this interference. They are just put between the power source and the radio.

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13y ago
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11y ago

The alternator is failing. To much ac current is getting by, aka "ripple".

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Q: Why does my am car radio have static only while driving?
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