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TAG Heuer timers CP520/CP540/545 and HL440 are powered by a cable with a specific 3-pin connector.
Does anyone know the assignment of these three pins? In an emergency, checking with a multimeter can help (check the polarity of the mains supply), but the meaning of the third pin is not clear to me. The cable also has three cores.

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Thank you very much. In the meantime, I used a multimeter measurement and found that the center contact is not used. So it has no purpose.
So it was no problem to make a cable for power 12V DC from the car's CL socket, power bank, etc. An alternative to a set of spare cells. Works for TAG Heuer CP520, 540, 545 and HL440 series.


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