What is the W wire in a car alternator?

1 Answers
VanDallas
07/30/25 7:00am
WU_BA_QI_CHE_PIC_PLACE_HOLDER The W terminal is the phase lead wire, generally used as the electrical signal input for the speed sensor. Below are detailed introductions about it: 1. Introduction one: The W of the motor mainly outputs AC voltage, which can be used for the measurement of the car's power tachometer and other AC equipment. 2. Introduction two: The D terminal is the charging (fault) indicator light terminal. The D+ of the alternator is connected to the excitation coil, and the three small power magnetic field diode terminals provide continuous excitation current to the rotor. 3. Introduction three: The E terminal is the ground wire, generally the alternator casing is used for grounding. For double-wire alternators, the casing is not grounded, and the E terminal is connected to the power ground wire.
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