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The 50hz/60hz thing is for clocks driven off the A/C power grid.

The alternator puts out rectified A/C ( DC), so the radio clock is probably quartz crystal referenced but drifts due to other components going out of tolerance, like capacitors, resistors, or maybe the IC that's providing the buffered oscillator output is slow for whatever reason, could be thermal related who knows.
Judging by the high rate of radio failures I see posted on here, they're obviously built with crappy components, so it's not very surprising that the clocks can't keep the right time.
 

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Judging by the high rate of radio failures I see posted on here, they're obviously built with crappy components, so it's not very surprising that the clocks can't keep the right time.
Probably has wax paper caps right next to a heat source to make sure it doesn't last past 10 years.

When mine goes I don't think I'll replace it with a factory radio.
 

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Yep some of my pals encountered that. problem is the processor so in my opinion, just change it. Reason behind that is the clock can't handle the heat so the quality deteriorates.
 
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