How To Connect Car Battery Jump Leads. You dont actually need to since the circuit will still be completed when you connect the cable to ground - but the reason it isnt recommended is because batteries can omit volatile gases. When you hook up a set of cables to jump start a car you should never connect the black cable to the negative terminal on the old battery.
Connect the negative cable to a ground. Cables should be first connected to the donor vehicles battery and then to the dead battery. The positive should be red and the negative should be black.
Connect one red clamp to the positive terminal of the dead car battery.
Pop both hoods and then connect the red and black clamps to the battery in the car that wont start. Connect the other negative black cable to the clean unpainted metal surface under the disabled vehicles hood. Connect the positive cable to the positive terminal on your car battery. Unpainted metal on the engine block or.
