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Here is a step-by-step guide on how to disassemble and troubleshoot a faulty Mercedes w114/115 clock.
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Locate the area that houses the clock. Unscrew the two barrels and place it aside.
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Carefully pull out the clock without damaging any other parts.
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Connect the screw (located behind the clock) to the negative supply of the battery, and then the small pin to the positive supply.
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To check the clock, set the time to something you can remember and set it aside.
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To check the power supply of the clock, locate the electrical connector and find the pin on it which supplies the power (12v) to the clock.
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Take a small bulb and socket and bridge a wire from the 12v pin supplied from the electrical connector, to one of the two wires on the bulb and socket.
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Next find a ground supply nearby ( the best place would be the key hole) and bridge another wire from it to the second available wire on the bulb and socket.
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If the bulb lights up, it means your clock has power.
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If the bulb lights up, the power supply to the clock is good.
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Start reassembling the dashboard by following the guide in reverse order.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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