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
      14.1.7.1. Unattended rechargeable batteries
      14.1.7.2. Check of the rechargeable battery
      14.1.7.3. Self-discharge of the rechargeable battery
      14.1.7.4. Charging of the rechargeable battery
      14.1.7.5. Storage of the rechargeable battery
      14.1.7.6. 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

14.1.7.2. Check of the rechargeable battery

GENERAL INFORMATION

There are two options of check of the rechargeable battery. Depending on them use of various test devices will be required.

Check of density of electrolyte

In combination with voltage measurement the actual density of electrolyte allows to draw a conclusion on accumulator razryazhennost degree.

To check it is applied accumulator денсиметр with a pipette. The more the specific weight (electrolyte density) of the drained-in electrolyte, the more deeply plunges a float (areometer). On a scale it is possible to consider electrolyte density in the form of the specific weight (g/ml) or degrees of Bome (+ ° Ve).

The following values (have to be reached at a temperature of electrolyte about +20 °C).

Accumulator razryazhennost degree	+ ° Ve	g/ml
It is discharged	16	1,15
It is half discharged	24	1,22
It is well loaded	30	1,26

Consistently check each separate element, all elements of a cell have to have the identical density of electrolyte (the maximum difference 0, 04 g/ml). Otherwise the faulty rechargeable battery can become isolated.

Check of the rechargeable battery under loading

PERFORMANCE ORDER

1. Connect the voltmeter to battery poles.

2. Instruction: if tension of the rechargeable battery (without connection of consumers) is less than 12 V, then it is discharged and it needs to be recharged.

3. Start the engine and consider tension.

4. In the course of start of the engine the charged rechargeable battery tension has to have not lower than 8 V (at a temperature of electrolyte about +20 °C).

5. If tension at once falls down and in cells various density of electrolyte was recorded, then the faulty accumulator can become isolated.

The general tension can be measured by means of the device for check of a condition of rechargeable batteries. Pay attention to recommendations of the manufacturer about care of the rechargeable battery.

Control values

CAPACITY OF THE BATTERY, A*CH	LOADING CURRENT, AND	MINIMUM TENSION LATER 5–10 SEC. At t of 0-20 °C
62	190	10,0 B
74	265	10,0 B
100	300	10,0 B

Prevention

If during this measurement (lasting 10 sec.) the general tension falls lower than 10 V, then the rechargeable battery or is discharged or faulty.