One utility ground (with iron) two signal wires: one water temperature meter (5v) and one 12v for the engine computer. The three-wire water temperature sensor is actually the thermal resistance, with the change of temperature, the resistance value of the sensor also changes correspondingly, one end of the resistance leads to a wire, the other end leads to two wires, in order to compensate the influence of the wire resistance on the sensor. To judge the quality of the sensor, you can use a multimeter to measure the resistance at both ends to judge the quality of the sensor.
One utility ground (with iron) two signal wires: one water temperature meter (5v) and one 12v for the engine computer. The three-wire water temperature sensor is actually the thermal resistance, with the change of temperature, the resistance value of the sensor also changes correspondingly, one end of the resistance leads to a wire, the other end leads to two wires, in order to compensate the influence of the wire resistance on the sensor. To judge the quality of the sensor, you can use a multimeter to measure the resistance at both ends to judge the quality of the sensor.