Power electrical equipment Mercedes C-Class (W202)

Battery — Removal and Installation
The battery is located on the right side under the trunk floor. Important! Some serially installed car radios are coded. The anti-theft coding prevents unauthorised...

Maintenance free batteries
Mercedes C-Class vehicles are equipped as standard with a low-maintenance battery. This battery no longer requires the addition of distilled water as before, but there...

Checking the battery
There are two options for testing a battery. Depending on them, you will need to use different testing devices. Checking the density of the electrolyte In combination...

Self-discharge of the battery
Depending on the vehicle's equipment, the natural discharge of the battery is facilitated by the current consumption of various control systems even when the engine is...

Charging the battery
The items marked with a + sign apply only to the maintenance-free battery that is installed as standard. Please note these instructions. If an additional battery that...

Storage of the battery
Batteries that have not been used for a long time discharge themselves and, in addition, their plates may be sulfated. If these batteries are charged with a fast...

Diagnosis of battery malfunctions
Battery troubleshooting CAUSE REMEDY Electrolyte level too low Recharge. Evaporation (especially in summer) Add distilled water to the prescribed level (for a charged...

Generator — Description and Safety
Mercedes C-class engines operate with a three-phase alternator. Depending on the model and equipment, generators of different power are installed. The generator is...

Generator — removal and installation
Removal 1. Terminal wire 30 (B+); 2. Terminal wire 61 (D+); 3. Bolts; 4. Contact protection; 5. Generator 1. Disconnect the ground (–) cable from the battery terminal....

Checking the generator charging voltage
1. Connect a voltmeter between the positive and negative terminals of the battery. 2. Start the engine. During the starting process, the voltage may drop to 9.5 V. 3. At...

Replacing and checking the generator/voltage regulator carbon brushes
The voltage regulator is built into the carbon brush holder. Carbon brushes can be replaced individually, although this requires some skill; on average, they wear out...

Generator fault diagnostics
Generator fault diagnostics CAUSE REMEDY When the ignition is on, the battery charge indicator does not light The battery is discharged Charge the battery. The wires on...

Starter — General Description
The combustion engine is started by a small electric motor called a starter. In order to start the engine at all, the starter must accelerate to a speed of at least 300...

Starter — removal and installation
1. Terminal wire 30; 2. Terminal wire 50; 3. Bolts; 4, 6. Holder; 5. Holder (only for petrol engines); 7. Spring clamp/holder; M1. Starter Removal 1. Disconnect the (–)...

Starter fault diagnostics
If the starter does not turn, then first of all check whether there is the voltage required for retraction at terminal 50 of the traction relay - at least 8V. If the...

Traction relay — removal, testing and installation
If the traction relay fails, the gear in the starter is not attracted to the toothed rim of the flywheel. Because of this, the starter cannot turn the engine shaft. This...

Main faults of starter and generator
The most common malfunction in electric motors is a breakdown of insulation in the windings. Let's say you parked your car and forgot to turn off the winding wipers....

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TEXTHTMLBB Code

190 (W201) (1982-1993)