Knowing how to start a dead battery can save you a good amount of time. While roadside assistance can be a life saver, you may be able to get back on the road before help even arrives. It all comes down to how much you know. We here at BMW of Springfield are here to help you start a dead battery!
- Identify the positive (red) and negative (black) terminals of each battery. Do the same for your jumper cables.
- Attach one end of the positive (red) jumper cable to the dead battery’s positive terminal. Attach the other end to the live battery’s positive terminal. You could be seriously injured if you aren’t careful.
- Attach the negative (black) end of the jumper cable to the live battery’s negative terminal.
- Attach the other end of the negative cable to a piece of unpainted metal beneath the hood near the battery. Jumping posts and engine bolts are perfect spots. Avoid belts and fans.
- Make sure everything is secure.
- Start the engine of the car with the live battery. Let it idle for a few minutes.
- Start the car with the dead battery. If it starts, let both cars idle for a few minutes. If it doesn’t call for help or wait a few more minutes and try again.
- Once both cars are running, you can disconnect the cables. Detach the jumper cables in the opposite order you put them on.