What are the reasons why the Volkswagen CC generator does not generate electricity?
2 Answers
When the unit is running and the generator speed reaches the rated speed, after closing the AC exciter stator excitation circuit switch and adjusting the voltage potentiometer to the higher direction to a larger value, the generator has no output voltage or the output voltage is very low, resulting in the generator not generating electricity. The following is an analysis of the fault reasons why the generator does not generate electricity: 1. The residual magnetism of the generator core disappears or is too weak: Due to long-distance transportation vibration or the generator being stored for too long, the residual magnetism of the generator core disappears or weakens, causing the residual magnetic voltage of the generator to disappear or be less than the normal residual magnetic voltage value, that is, the residual magnetic line voltage is less than 10V, and the residual magnetic phase voltage is less than 6V. Since the stator and rotor of the synchronous generator and the stator and rotor core of the AC exciter are usually made of 1~1.5mm thick silicon steel sheets, the residual magnetism is easily lost or weakened after excitation due to vibration. 2. Incorrect wiring of the excitation circuit: During generator maintenance, the polarity of the excitation winding is accidentally reversed, causing the magnetic field generated by the excitation winding current to counteract the residual magnetic direction after power-on, resulting in the loss of residual magnetism. In addition, during maintenance, when measuring the DC resistance of the excitation winding or testing the automatic voltage regulator (AVR) to pass DC current to the excitation winding, failure to pay attention to its polarity can also cause the loss of residual magnetism in the core. 3. Open circuit in the excitation circuit: Poor electrical contact in the generator excitation circuit or loose connections of electrical components, broken leads, etc., cause the circuit to be interrupted, and the AC generator excitation winding has no excitation current.
I once experienced the alternator not charging in my Volkswagen CC, and it was truly frightening. After starting the car, the battery light on the dashboard stayed on, and the headlights dimmed. Possible causes could be a loose or broken alternator belt, which is the most common issue; worn-out brushes inside the alternator, leading to poor contact over time; a faulty voltage regulator, unable to control the output; or wiring problems, such as a blown fuse or loose connections. I think the Volkswagen CC's electrical system is quite sophisticated—if the alternator fails, the battery drains instantly, and the car can stall. You should quickly use a multimeter to check the voltage; if it's below 13 volts, it's basically confirmed. Don't delay—towing fees will cost you more. You need to find a professional shop to diagnose and replace any faulty parts. Regularly check the belt's condition to prevent unexpected issues.
