Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car

Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. System of ignition
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
- 14. Electric equipment
   14.1.2. Measuring devices
   14.1.3. Technology of measurements
   14.1.4. Checks of electric equipment
   14.1.5. Sound signal
   14.1.6. Replacements of safety locks
   - 14.1.7. Rechargeable battery Unattended rechargeable batteries Check of the rechargeable battery Self-discharge of the rechargeable battery Charging of the rechargeable battery Storage of the rechargeable battery Diagnostics of malfunctions of the rechargeable battery
   + 14.1.8. Generator
   + 14.1.9. Starter
   14.1.10. Traction relay
   + 14.1.11. System of lighting
   14.1.12. Devices
   14.1.13. Dashboard
   14.1.14. Glow lamps on the dashboard
   14.1.15. Light switch
   14.1.16. Radio receiver
   + 14.1.17. Antenna
   14.1.18. Loudspeakers
   + 14.1.19. Rubber brushes of screen wipers
   14.1.20. Windscreen washer jets
   14.1.21. The washing nozzles of headlights
   14.1.22. Screen wiper and its engine
   14.1.23. Protect the car
   14.1.24. Anticreeping "immunodeficiency"
   14.1.25. Why headlights grow dull
   14.1.26. Galogenka
+ 14.2. Electrical circuitries Charging of the rechargeable battery


The positions marked by a sign + concern only the unattended rechargeable battery which is installed serially. Take these instructions into account. If in addition rechargeable battery demanding more complex maintenance was installed, then take all positions into account.

Before charging check electrolyte level, if necessary add the distilled water.

Never close накоротко the rechargeable battery. At short circuit it heats up and can burst. Do not light the battery with an open flame. Electrolyte (on the basis of sulfuric acid) is the corroding liquid and should not get into eyes, on skin or on clothes, If necessary wash out a large amount of water the place on which electrolyte got.

Disconnect a positive wire and a wire of weight from plugs of the rechargeable battery. At accession and a detachment of wires pay attention to that there was no sparking. Therefore previously disconnect all consumers of current.

Before charging give the chance to be defended to the frozen rechargeable battery. The charged battery freezes approximately at a temperature of -65 °C, semi-loaded – about -30 °C, and discharged – approximately, at –12 °C.

Unscrew traffic jams from the rechargeable battery and put them on openings. It will prevent hit of splashes of electrolyte on a varnish, and at the same time at charging the formed gaseous products will be able to disappear.

Charge the rechargeable battery only in well aired room. At charging of the built-in rechargeable battery leave open a trunk lid.

At normal charging charging current makes 10% of capacity (at rechargeable battery with a capacity of 74 А*ч, therefore, about 7,4 And).

The rechargeable battery can be charged also by means of the fast-loading device.


Bystry charging of the rechargeable battery should not become a habit! You should not charge rechargeable batteries new or unused long time in an expedited manner.

Connect a positive pole (+) the rechargeable battery to a positive pole of the charger, and a negative pole (–) of the accumulator to a negative pole of the same device.

During charging temperature of electrolyte should not exceed 55 °C, in case of need interrupt charging or reduce charging current.

Load until brisk gas emission in all cells stops and any more tension and specific weight of electrolyte measured three times at an interval of one hour does not increase.

After charging check electrolyte level, if necessary add the distilled water. + Check electrolyte density. If the measured density in one cell is less than other values (for example, in five cells density makes 1, 26 g/ml, and in one cell – only 1, 18g/ml), then the rechargeable battery is faulty and it should be replaced (to restore).

Leave approximately for 20 minutes the rechargeable battery for full release of gases, then screw up traffic jams.


The engine should not work at the switched-off rechargeable battery, – the electric system is damaged.