How do you hook up jump cables to a car?

The safest order to attach the jumper cables is as follows:Attach one red jumper cable clamp to the positive terminal on the dead battery.Attach the other end of the same cable, the second red jumper cable clamp, to the positive terminal on the working (live) car battery.More items •14 Dec 2016

What do you connect to jump-start a car?

Connect the red clamp to the positive terminal on the dead battery. Uncoil the battery cable and hook up the other red clamp to the positive terminal on the live vehicle. While youre facing the good battery, connect the black end of the cable to the negative terminal.

What happens if you connect a car battery the wrong way round?

When a car battery is connected backward, a fuse designed to protect vehicle electronics should blow. If your vehicle doesnt have a fuse (almost all cars do) designed for this purpose, you will send electrical current backward through systems in your car, including ECU, transmission control unit, and more.