The output voltage of a car generator is generally between 13.7V and 14.5V. Operation steps: 1. Prepare a multimeter; 2. Adjust the gear to the DC voltage range and select the 20V position; 3. Open the car hood and find the positive and negative poles of the battery; positive pole and the black probe to the negative pole;5. Start the engine, then you can see the numbers displayed by the multimeter. For example, 14.20 is 14.2 V.
After the car's generator generates electricity, the voltage is 11.4 volts. This voltage must be at least 12 volts. The car's generator may be faulty. the circuit first to see if the wires are damaged? If it still doesn't work, I can only replace the generator with a new one, I will go to 4S store to find a professional master to check and repair it.