What are the faults of the generator and is it difficult to determine them?

The generator plays a huge role in the car functionality well, often its diagnostics is time-consuming, and to identify problems in its operation is not an easy task. The generator is inextricably linked to the battery, so the breaking of one disrupts the work of the other. Therefore, without diagnostics in the service center, there is no way round. Here are the main faults of the generator, which will already help you understand whether you need to go to the service station or you can solve this problem yourself, by paying attention to the general device of the generator.

1. Pulley — is responsible for the connection between the generator and the crankshaft.

Possible faults: the pulley has worn out, jammed or is slipping on the free run and the generator fails due to excessive load on the bearings;

Reason: weak and strong tension, respectively;

The decision/diagnosis: to weaken or strengthen the tension of replacement under conditions of high mileage.

2. Front bearing (hollow disk)

Possible faults: it can be out of order, collapsed, there were problems in its functioning;

Reason: long operation (a clear sign of creaking and noise), strong pulley tension (a clear sign is whistling);

The decision/diagnosis: bearing replacement.

3. Front cover

4. Back bearing (distance collar)

5. Rotor wheel — it must spin freely, a constant current is supplied to it, and, in fact, due to the formation of a magnetic field in the rotor, which leads, in turn, to the appearance of an electromotive force.

Possible faults: the runout of the rotor, jamming in the turn-to-turn connection, direct break of the winding (spooling);

Reason: wear out;

The decision/diagnosis: the diagnosis of the operation is carried out using a multimeter in the resistance mode, where the normal value is 1.8 – 5 Ohms. Above the cliff, below the circuit. Replace the coil to fix it.

6. Starter — is responsible for supplying voltage after rectifying the diodes in the battery and recharges it.

Possible faults: the burning of the winding, its rupture or decay;

Reason: external factors (water, salt, mud);

The decision/diagnosis: replacement of the winding, less often of the starter. It is difficult to diagnose, that’s why it is better to contact the service center. It is better to use a megameter, but a multimeter will do well, too. A sufficiently high voltage passes through the winding! To check the resistance in the starter winding, you need to calculate the formula and use the lab. power supply. In the forward direction, the resistance is 10+ Ohms, and in the reverse direction — infinite.

7. Back and brush cover

8. Brush holder — is a conductor of the direct current to the rotor.

Possible faults: The voltage drop of the charge;

Reason: Wear out, impurity;

The decision/diagnosis: replacement of brushes and brush assembly, clean the grooves from graphite dust. Diagnose on a cold course at the maximum consumption of devices, the minimum allowable rate of 13.1 V.

9. Diode set (rectifier) — converts current to direct current.

Possible faults: short circuit and burning;

Reason: Wear out, damages;

The decision/diagnosis: Decontamination (cleaning), rare — replacement. For diagnostic use a multimeter.

10. Voltage regulator — Regulates battery voltage.

Possible faults: Undercharging and recharging of the battery;

Reason: Wear out, low quality of the auto parts;

The decision/diagnosis: replacement, For diagnostic use a lab power supply.

11. Hardware