1. Park both vehicles close together. Make sure they're not touching each other.
2. Turn off the engines of both vehicles. Apply the parking brakes and put both cars in Park (for automatic transmissions).
3. Open the hoods of both cars. Locate the batteries; they're typically located in the front of the engine compartment.
4. Identify the positive (+) and negative (-) terminals on both batteries. They're usually marked with "+" and "-" symbols.
5. Connect one end of the red (positive) jumper cable to the positive terminal of the dead battery. Make sure it's securely fastened.
6. Connect the other end of the red (positive) jumper cable to the positive terminal of the working battery.
7. Connect one end of the black (negative) jumper cable to the negative terminal of the working battery.
8. Connect the other end of the black (negative) jumper cable to an unpainted metal surface on the frame of the car with the dead battery. This helps complete the circuit.
9. Start the vehicle with the working battery and let it run for a few minutes. This helps charge the dead battery.
10. Try starting the vehicle with the dead battery. It should start if it has enough charge.
11. Once the vehicle with the dead battery is running, remove the jumper cables in reverse order.
Remember to be cautious when handling car batteries. Don't touch the terminals of the cables while they're connected to the batteries, and ensure the cables don't touch each other or any other metal surfaces. If you're unsure about jumpstarting a car, consult your vehicle's owner's manual or seek help from a qualified mechanic.
