Failure detection and maintenance method for automobile generator without power generation

Failure detection and maintenance method for automobile generator without power generation

When the generator is suspected to be out of order, the vehicle can be preliminarily detected and disassembled, and the generator will not disintegrate and be further tested. The detection tool can be used multimeter (voltage, resistance profile), the general DC voltage meter, DC current meter and oscilloscope, can also use the automobile bulb, homemade small flashlight bulbs lights, can also change the status of the automobile detection.

When the generator is suspected to be out of order, the vehicle can be preliminarily detected and disassembled, and the generator will not disintegrate and be further tested. The detection tool can be used multimeter (voltage, resistance profile), the general DC voltage meter, DC current meter and oscilloscope, can also use the automobile bulb, homemade small flashlight bulbs lights, can also change the status of the automobile detection.

1. car inspection method

When a generator is suspected of not generating electricity, the generator can be disassembled and tested on the vehicle to determine whether there is a fault or not.

11 thousand meter voltage profile detection

The multimeter knob to the DC voltage 30V file (or the general DC voltage meter, the appropriate file) the red pen is connected with the generator connected "armature" column, the black pen is connected to the case, let the engine run in medium voltage electrical system above, standard 12V value should be about 14V, 24V electrical system voltage the standard value should be about 28V. If the measured voltage is the battery voltage, it shows that the generator does not generate electricity.

1.2 external ammeter test

When there is no ammeter on the instrument panel, an external DC ammeter is used to detect it. The first generator "armature" column connecting wire removed, then the range is about 20A DC ammeter positive dynamo "armature", the anode wire is connected to remove the connector. When the engine is operating at a medium speed (without using other electrical equipment), the ammeter has a 3A~5A charging indication that the generator is functioning properly, otherwise the generator does not generate electricity.

1.3 test lamp (car light bulb) method

When there is no multimeter and direct current meter, the automobile bulb can be used as a test lamp to detect. Lead to the two ends of the bulb proper welding length, and the connected to the two ends of the alligator clip. Before inspection will lead the generator armature "column removed, one end clamped generator" armature "then try lamp pole at the other end of the ground, when the engine is idling, pilot lamp brightness indicating that the generator is working properly, otherwise the generator power generation.

1.4 change engine speed and observe headlight brightness

After starting the engine, turn on the headlights, so that the engine speed from idle to gradually increase to medium speed, headlight brightness if the speed increases with the increase, indicating that the generator is working properly, otherwise it does not generate electricity.

1.5 remove the battery ground at the engine (gasoline engine) is working method

When the car does not have a microcomputer to control the electronic device, it can be detected by this method. The engine speed control in the above, to remove the battery strap (usually by disconnecting the battery switch on the control wire), if the engine is working, that a generator or generator failure.

Inspection and judgment of 2. cars without disassembly

After the generator is removed from the vehicle, the following method can be checked to further determine the fault.

2.1 judge with a small bulb (a light bulb)

Connect the ends of the bulb to a small test lamp and connect between the generator armature and the housing. With wires of the battery (battery or the same voltage) of positive and negative electrodes are respectively connected to the generator field two connected column "F1", "F2" (AC generator ground connection "F" and "ground" column), let the battery for generator excitation. Turn the engine belt quickly by hand. The small test light shows that the generator is working properly, otherwise the generator does not generate electricity.

22 thousand meter voltage files

Let the battery to the generator excitation (with 2.1 connection method), the multimeter in DC voltage of 3 5V (or the general DC voltage meter the appropriate file) file, black and red pen are respectively connected with the "ground" and "generator armature" column, turn the belt pulley by hand, multimeter (or DC voltage table pointer) should swing, or power generator