Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
- Electrotechnical equipment
   Minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Connections of wires
   Central switching knot
   Support of additional relays
   Box for electronics
   Relay and control units
   Switching relay
   H-contact of the relay of unloading
   Table of the relay and control units
   Safety locks
   Table of safety locks
   + Electric circuits
   + Accumulator
   - Generator
      Generator of alternating current
      Control bulb of charging
      Tension regulator
      The self-help in work with the generator and the regulator of tension
      The movement with the defective generator
      Maple and poliklinovy belt
      Check of a condition of a maple and poliklinovy belt
      Replacement of a maple and poliklinovy belt
      The belt torn maple
      Review: maple and poliklinovy belt
      The help at malfunctions
   + Starter
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

The self-help in work with the generator and the regulator of tension

Maintenance of the generator of alternating current is not provided if to exclude extremely seldom arising need for replacement of graphite brushes. More serious damages cannot be eliminated by means of amateur means.

To uncover (2) generators of Bosch firm, weaken three screws with crosswise heads (1), remove B+ wire from a cut finger (3) and take out fixing ledges (shooters) from grooves.

The regulator of tension (2) keeps on two screws with crosswise heads (1). The figure "3" designated an axis of the sliding contact in the generator.

On the dismantled tension regulator (4) we designated length of contact brushes (2) shooters. The figure "1" showed contacts of the regulator of tension, "3" – fixing screws.

Check of tension of charging


  1. Connect the voltmeter between a plus pole of the generator and weight.
  2. Start the engine on average turns.
  3. At the serviceable regulator of tension the device will show approximately from 13,3 to 14,6 Century.
  4. If it not so, check graphite brushes or replace the regulator.
  5. The generator is otherwise faulty.

Check of graphite brushes


  1. Disconnect a minus pole of the accumulator.
  2. Depending on model of the car provide access to the back party of the generator (for example, dismantle a broad tank or facing of a motive compartment) or dismantle the generator.
  3. Dismantle a cover behind on the generator.
  4. Remove the regulator from the generator. For this purpose weaken both fixing screws.
  5. Cast away the regulator a little in order that graphite brushes did not hang.
  6. Measure a ledge of graphite brushes: new graphite brushes have length about 13 mm; the size of wear is 5 mm.

Replacement of graphite brushes

Replacement of graphite brushes is not provided in modern generators any more – graphite brushes are not delivered as spare parts any more. If they were erased, it is necessary to change completely the regulator.

But if someone can get graphite brushes in a workshop on repair of the electrotechnical equipment of cars as spare parts, can make separate replacement: in this case the soldering iron, solder and, besides, ability to solder are necessary. The description given below belongs to the generator of Bosch firm:


  1. Dismantle the regulator from the generator as it is described above.
  2. Unsolder connecting plaits, take out graphite brushes.
  3. Remove press springs from old brushes and put on new brushes.
  4. Solder connecting plaits.
  5. Use thus a little tin solder and work quickly that connecting plaits did not become impregnated with tin. Otherwise they will lose flexibility.

 Council: At the dismantled regulator you can also check copper contact rings of the core of the generator (on them graphite brushes move). If on them already there are scars extra earnings, they can be chiseled and polished in a workshop on repair of the electrotechnical equipment of cars.

Dismantle of the generator


  1. Disconnect the accumulator wire connected to weight, differently there is a danger of short circuit.
  2. Four-cylinder engine: where is, unscrew a weight wire.
  3. Take off a klinorebristy belt (it is described in the head further).
  4. Dismantle the connected wire.
  5. Unscrew fixing bolts of a collar of the generator and take out them, hold thus the generator.
  6. Six-cylinder engine: take off a klinorebristy belt (it is described in the head further).
  7. Dismantle the lower cover of a motive compartment.
  8. Dismantle from below the connected wire and directing a stream of fresh air.
  9. Weaken fixing bolts, remove the generator.