1. Park both vehicles close together, with their engines off. Make sure the vehicles are not touching.
2. Open the hoods of both vehicles.
3. Locate the positive (+) and negative (-) terminals on the batteries of both vehicles. The positive terminal is usually marked with a "+" symbol and the negative terminal is usually marked with a "-" symbol.
4. Connect one end of the positive (+) jumper cable to the positive (+) terminal of the dead battery in your BMW.
5. Connect the other end of the positive (+) jumper cable to the positive (+) terminal of the fully charged battery in the other vehicle.
6. Connect one end of the negative (-) jumper cable to the negative (-) terminal of the fully charged battery in the other vehicle.
7. Connect the other end of the negative (-) jumper cable to an unpainted metal surface on your BMW, away from the battery. This is called the ground connection.
8. Start the engine of the vehicle with the fully charged battery and let it run for a few minutes. This will help charge the dead battery in your BMW.
9. Turn off the engine of the vehicle with the fully charged battery.
10. Disconnect the jumper cables in the reverse order that you connected them.
Your BMW's battery should now be boosted enough to start the engine. If the engine does not start, there may be another issue with the battery or the vehicle.
