When there is no ammeter on the car dashboard, an external DC ammeter can be used to detect it.
The car generator is mainly composed of rotor, stator, rectifier and end cover. Its function is to power the car equipment and charge the battery when the engine is turned on. the car engine is running.
Turn the multimeter knob to the 30V DC voltage gear, connect the red test lead to the “armature” terminal of the generator and the black test lead to the case. Leave the engine running at medium speed or higher. The standard voltage value of 12V electrical system should be around 14V. The standard voltage value of 24V electrical system should be around 28V. If the measured voltage is the battery voltage, it means that the car's alternator is broken.
Check the vehicle
If thecar does not stall immediately, change the speed of the accelerator pedal, and observe whether the voltage between the positive output terminal of the generator and the ground fluctuates, whether the voltage is unstable, or whether the voltage is not around 12 V, the generator is damaged. If it operates normally, remove the positive battery terminal. If the car stalls immediately, the alternator may not be able to produce electricity.
Check the generator rotor, see if the slip rings are dirty and abraded, and use a multimeter to measure if there is continuity between the slip rings. Then check the degree of insulation of the winding from the magnetic field. If the measured resistance value is infinite, it means it is normal. Motor vehicle generators are essentially alternators. When measuring alternator quality, use caution and never use the "scraping" method.". tests whether it is necessary to produce electricity. If the generator does not operate normally, it is recommended to go to a maintenance point and have it repaired by professional technicians.
1. During long-term use of the generator, the enameled wire ages due to high internal temperature and vibration (insulation performance decreases)
Solution: Replace the enameled wire.
2. Due to bearing play, friction between the stator and rotor of the generator causes an internal short circuit.
Solution: Repair the generator bearings.
Detailed information:
Notes
① Frequent cleaning remove dirt and dust from the generator surface, keep it clean and well ventilated.
② Frequently check the tightening conditions of the generator-related fasteners and tighten the screws in time.
③The tension of the courttransmission wheel must be appropriate. If it is too loose, it will slip easily and result in insufficient power production; if it is too tight, it will easily damage the belt and generator bearings.
④When installing the battery, be careful not to install it incorrectly. Usually, install the positive wire first and not the ground wire, otherwise the diode will burn out easily.
⑤ When using an integrated circuit regulator, the ignition switch should be turned off immediately when the engine is not running.
⑥ It is never allowed to use the “scraping” method to test whether to produce electricity.
⑦ When the generator fails to generate electricity, it must be eliminated in time, otherwise it will cause a more serious breakdown.