The generator is the powerhouse of your car. When the engine is running, it provides all electrical units with current and charges the battery

In the car, depending on the engine model and equipment, an alternator works.

Accessories determine whether the alternator is driven by a V-belt or V-belt.

Since the battery must be charged with DC current, the semiconductor diodes take care of rectifying the AC current.

These diodes are very sensitive to high voltage. The faster the generator rotor rotates, the higher the voltage rises.

The current consumers in the car will not withstand such ups and downs for long. Therefore, there is a voltage regulator that limits the voltage and at the same time prevents the battery from being overcharged.

Let's consider the defects that may occur during the operation of the generator:

When the engine is running at medium speed, the voltage indicator shows below 12 V:

- Faulty voltage regulator

Replace voltage regulator

- The drive belt is loose

Tighten the belt

- Broken wires from <+> or <W>

Repair wires

- Missing or unreliable contact between brushes and slip rings

Clean the brush holder from dirt, check the force of the brush springs, clean or grind slip rings

- Open excitation circuit

Repair the open circuit, especially carefully check the soldering points of the excitation coil leads to the slip rings and the serviceability of the coil leads

- Interturn short circuit or open circuit in one of the phases of the stator winding of the generator

Disassemble the generator, check the stator winding for open and short circuits

Replace a stator with a defective winding

- Failure of one of the diodes of the rectifier unit

Check the diodes with instruments or a test lamp

Replace the block with faulty diodes

Quick wear of brushes and slip rings:

- Increased slip ring runout

Turn and grind slip rings

- Oil getting on slip rings

Wipe slip rings and brushes with a cloth soaked in gasoline

- Increased or reduced brush spring pressure

Check brush spring pressure

Increased generator noise:

- Insufficient amount of grease in the bearings

Replace bearings

- Rotor touching the starter poles

Replace generator cover

- Bearing wear

Replace bearings

- Bearing seizing

Replace bearings

- Development of a bearing seat

Replace generator cover

- The tightening screws of the generator covers have loosened

Tighten the clamping screws with a torque of 0.5 kgf.m

Breakage of the bracket and paws for fastening the generator. Frequent loosening of the generator:

- Incorrect installation of the generator on the brackets

Install Generator

- Increased pulley or rotor imbalance

Check dynamic balance of pulley and rotor.

If the unbalance exceeds 10 gsm, balance the parts

- Increased motor imbalance

Check engine dynamic balancing