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Use your multimeter to determine the polarity of the thermistor leads. You need to label the existing thermistor lead in the top of the printer The same as you labeled it in the bottom of the printer. This lead will eventually be soldered to the GREEN wire from the new hotend whip.

Contact the probe from your multimeter against the metal tab in the latching housing as shown in the picture with the blue arrow.

Be sure to label the thermistor wire! Polarity does matter!

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