Why does my clock keep going off?
The most common cause of an analog clock losing time is that there is buildup in the battery compartment that is keeping the battery from connecting fully with the clock mechanism. Remove the battery and check the leads to see if there is any buildup from a leaky battery, dust, etc.
Why are car clocks inaccurate?
Most of the clock in todays’ cars use electronic crystal oscillators. Crystal oscillator sold for around a dollar or less in bulk have a typical error tolerance of +/-100 ppm. Temperature changes and aging can contribute another +/-100 ppm.
How do car clocks work?
The clocks are run through a set of contact points wired in series with the solenoid coil. As the clock runs, an arm with one contact point moves closer to its mating contact. The design is such that it allows the points to close, completing the circuit before the spring winding runs down.