Step 1:

Before you attempt to jump start the car, make sure both batteries are of similar voltage or you risk damaging electrical components.
 

Step 2:

Get the cars as close together as possible but do not allow the cars to touch one another.
 

Step 3:

With both cars off and in ''park,'' connect the jumper cables in the following order:

• Connect one red clamp to the positive (+) battery post of the ''dead'' battery.
• Connect the other red clamp to the positive (+) post of the good battery.
• Connect one black-end clamp to the negative (-) post of the good battery.
• Carefully connect the other black-end clamp to some large metallic part of your car's engine block. Never connect it to the negative (-) post of the ''dead'' battery. This causes sparking, which could ignite battery gases.

Step 4:

Start the working car and run it at idling speed for a few minutes. After letting it run, start the ''dead'' car. Once your ''dead'' car has started and is running, immediately disconnect the jumper cables in the reverse order.