Before attempting to jump-start a car battery, you will need jumper cables and another vehicle with a charged battery. Ensure both cars are in park or neutral and turned off. Additionally, locate the battery terminals on each car—they're usually labeled positive (+) and negative (-).

To connect the jumper cables, first position the vehicles close enough for the jumper cables to reach but not so close that the two vehicles are touching each other. Next, attach one end of the red (positive) jumper cable to the positive terminal of the dead battery.

Then, connect the other end of the red jumper cable to the positive terminal of the charged battery. After that, attach one end of the black (negative) jumper cable to the negative terminal of the charged battery. Finally, connect the other end of the black jumper cable to an unpainted metal surface under the hood of the dead car. This serves as a grounding point and helps prevent sparks near the battery.

After a few minutes, attempt to start the vehicle with the dead battery. If it doesn't start immediately, wait a couple of minutes and try again. If the engine still doesn't turn over, you may need to double-check the cable connections and try restarting the dead vehicle.

Once the dead vehicle starts, carefully remove the jumper cables in the reverse order they were connected. First, remove the black jumper cable from the grounded metal surface. Then, disconnect the black jumper cable from the negative terminal of the charged battery. Next, remove the red jumper cable from the positive terminal of the charged battery. Finally, disconnect the red jumper cable from the positive terminal of the previously dead battery.