Jump-starting from another car can, of course, temporarily solve your problem. However, it is important to find out the reason that led to the battery discharge.
There could be three such reasons:
1. The battery may have been discharged from numerous attempts to start the engine or because the external lights were not turned off.
2. The battery charging system is faulty [the generator drive belt is loose or broken, or the generator wiring is faulty, or the generator itself is faulty].
3. The battery is faulty [low electrolyte density or damaged plates).
Article was borrowed from the website: www.MercedesMan.ru
When starting the engine from another battery, take into account the following precautions:
Before connecting an external battery, make sure the ignition is off.
Make sure all electrical equipment is turned off (lighting devices, heater, windshield wipers, etc.)
Make sure the replacement battery has the same voltage as yours.
If the battery of another vehicle is used as a bypass battery, the vehicles must not touch each other.
Make sure the transmission is in Neutral (or PARK if automatic transmission).
1. Connect one end of the red jumper cable to the positive (+) terminal of the dead battery.
2. Connect the other end of the red wire to the positive (+) terminal of the external battery
3. Connect one end of the black jumper cable to the negative (-) terminal of the other battery
4. Attach the other end of the black wire to some bracket on the engine you want to start, away from the battery
5. Make sure that the connecting wires do not touch the fan, drive belts or other moving parts of the engine.
6. Start the engine from a different battery. When the engine starts to idle steadily, disconnect the connecting wires in the reverse order of connection.
