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Just a little more info about these clocks to supplement what Jimmy said...
The clocks have this funny little automatic wind system that uses a solenoid to wind them. If you listen to a clock, you hear tick tick tick for about 2 minutes, then CLUNK followed by tick tick tick. The clunk is the solenoid engaging to do the wind function. And the solenoid engages using contacts or points. These can get dirty and need cleaning. So take apart the clock and carefully clean the solenoid points using fine emery cloth or similar.
So the only time the clock is drawing power from the car is during the CLUNK. And the CLUNK draws a spike of current from the system which can also blow the little thermal fuse as things age. Of course when that happens, as you know, the clock doesn't work at all and you have to replace the fuse with something.
So an intermittent failure is most likely dirty points.
eric in vermont
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