1. Ensure both the dead battery and the working battery are 12-volts.
2. Park the working vehicle close to the Mercedes E350, ensuring the two vehicles do not touch.
3. Turn off the engines of both vehicles and apply the parking brakes.
4. Locate the positive (+) and negative (-) terminals of both batteries. The positive terminal is usually marked with a "+" symbol, and the negative terminal with a "-" symbol.
5. Connect one end of the positive (red) jumper cable to the positive terminal of the dead battery and the other end to the positive terminal of the working battery.
6. Connect one end of the negative (black) jumper cable to the negative terminal of the working battery.
7. (Optional) If the Mercedes-Benz E350 has an intelligent battery sensor (IBS), connect the other end of the negative (black) jumper cable to an unpainted metal surface on the engine block, away from the battery. This is to avoid any potential damage to the IBS.
8. Start the engine of the working vehicle and let it run for a few minutes. This will help charge the dead battery.
9. Attempt to start the Mercedes E350.
10. If the Mercedes-Benz E350 starts, let both vehicles run for several minutes. This will help charge the dead battery further.
11. Disconnect the jumper cables in the reverse order you connected them.
12. Allow the Mercedes-Benz E350 to run for at least 30 minutes before turning it off. This will help ensure the battery is fully charged.
Note: If the Mercedes E350 doesn't start after performing the above steps, there may be an issue with the battery or another part of the electrical system. In such cases, it's recommended to consult with a qualified mechanic or visit a Mercedes-Benz dealership for further assistance.
