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
   Wires
   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





Control bulb of charging

  • At a control bulb in the combined device two plus connections: first, on the plug D + the generator (a blue wire) and, secondly, on the plug 15 via the green mnogoshtyrkovy socket behind on the device (a black/red wire) going from the ignition lock.
  • At inclusion of ignition on the plug 15 tension moves. But the generator does not work yet therefore the disconnected contact of D + works as "minus". The control bulb since between tension of the onboard network receiving power supply from the accumulator, and distinction exists tension of still not working generator lights up.
  • When the engine is started and the generator reaches number of turns of charging then the regulator of tension connects the generator to the onboard electrotechnical equipment. Now positive current arrives from the plug 15 and in addition from the plug D +. Thanks to it already there is no distinction in tension, the control bulb of charging dies away.
  • The control bulb is not necessary for so-called "preliminary excitement" of the generator of alternating current any more, in Audi A4 it occurs already during start of the engine via the ignition lock plug 50a.

Not always there is charging

That the accumulator is charged from the generator, the gone-out control bulb does not prove. It says only that there is no more distinction in tension between the accumulator and the generator. If, for example, during the operation of the engine on single turns all consumers of current are included, the control bulb does not light up though more current of the accumulator is consumed, than can give less powerful generators: nevertheless there is no distinction in tension in comparison with the accumulator.