Contents: If the engine does not start and the…↡ If the engine does not start even…↡ Starting from an external source ↡
If the engine does not start and the starter does not work
If this is a model with an automatic transmission, make sure the gear shift lever is in the P or N position.
Open the hood and make sure the battery terminals are clean and live.
Turn on the headlights and try to start the engine. If the headlights dim when you try to start the engine, then your battery is probably dead. In this case, try to jump start the engine.
If the engine does not start even though the starter works normally
Check that there is fuel in the tank.
Check for moisture on electrical components under the hood. Turn off the ignition, then wipe wet components with a dry cloth. Apply a water-repellent spray (WD-40 or equivalent) on electrical connectors. Pay special attention to the ignition coil wiring connector and high-tension wire. Diesel engines do not usually suffer from this disease.
A Check that the high-tension wires are securely connected to the spark plugs (4-cylinder engine shown).
IN Check that the high-tension wires are securely connected to the ignition distributor (4-cylinder engine shown).
WITH Check that the high-voltage wire and electrical connectors are securely connected to the ignition coil (4-cylinder engine shown).
D Check the electrical connector connection to the ignition control unit for reliability (with ignition off).
E Check the condition and reliability of the battery terminal connections.
Starting from an external source
Caution: Before connecting the external battery, make sure the ignition is off.
Caution: Make sure all electrical equipment (headlights, heaters, windshield wipers, etc.) turned off.
Caution: Observe all special precautions marked on the battery.
Attention! Cars must not touch each other.
Caution: Make sure the gearshift lever is in neutral position (or PARK in case of automatic transmission).
Connect one end of the large red wire to the positive terminal of the dead battery.
Connect the other end of the red wire to the positive terminal of the booster battery.
Connect one end of the heavy gauge black wire to the negative terminal of the booster battery.
Connect the other end of the heavy gauge black wire to the power unit or body element of the vehicle being started, away from the battery.
[Text republished from the website: MercedesMAN]
Make sure the wires do not come into contact with the fan, drive belts or other rotating parts of the vehicle.
Start the engine using an external source (in this case, the engine of the source vehicle must be idling). After starting the engine of a car with a discharged battery, disconnect the wires in the reverse order.