Do not attempt to jump-start your car if your battery displays signs of these damages, as you may cause injury to yourself or others if you do so.
If your battery cables are corroded, clean them as best as possible using a brush with stiff bristles.
Verify that the distance between each car’s battery is close enough for the jumper cables to connect the cars together. The length of jumper cables varies greatly depending on their style and manufacturer. Do not attempt to connect two different pairs of jumper cable together if your first pair isn’t long enough. This can melt the jumper cables and start a fire.
If the engine in the car with the dead battery fails to start, allow five more minutes to pass for the dead battery to charge.
Disconnect the grounding cable first, then the cable attached to the negative terminal on the battery, then the cable attached to the positive terminal of the battery of the car that provided the jump, and finally the cable attached to the positive terminal on the previously dead battery.
