BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Cooling systems, heating
+ Power supply system and release
- Engine electric equipment
   + System of ignition
   + System of preheat of the diesel engine
   - Systems of a charge and start
      Removal and installation of the rechargeable battery
      The low-served rechargeable battery
      Check of the rechargeable battery
      Self-discharge of the rechargeable battery
      Charging of the rechargeable battery
      The generator - general information
      Security measures during the work with the generator
      Check of tension of charging of the generator
      Removal and installation of the generator
      Check and replacement of brushes of the generator and regulator of tension
      Removal and installation of a starter
      Removal, check and installation of the electromagnetic traction relay
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics

Check of tension of charging of the generator


1. Turn on the voltmeter between positive and negative poles of the rechargeable battery.

2. Start the engine. At the same time tension can fall to 8 V (at an external temperature + 20 °C).

3. Increase engine speed to 3000 rpm. Tension at the same time has to make 13.0 - 14.5 V. Eto points out serviceability of the generator and regulator. The generator tension (onboard tension) has to be higher, than tension of the rechargeable battery that in the course of the movement it was charged.

4. Check the regulator. For this purpose turn on driving beam and measure tension at 3000 rpm. Tension should not exceed more, than on 0.4 B values, received at the previous measurement.

5. If malfunction was not found, check brushes or repair the generator (work HUNDRED).