Clamp the negative cable (black) to the negative terminal of the good battery. Clamp the other end of the negative cable to a clean metal part of the engine (like a bolt head or bracket) in the car with the weak battery. Keep the clamp away from the battery, any moving parts and the fuel system.

Which clamp is positive on jumper cables?

red clamp Take the red clamp in your hand and attach it to the positive terminal of the dead battery. Do not let the black clamp on that end of the jumper cable touch metal or the red clamp. After youve attached the red clamp to the positive terminal, set the black clamp down on a plastic part under the hood.

When hooking up the jumper cables the last cable to connect negative should go where?

STEP 8: Dead battery: Attach the other Negative Jumper Cable Lead to a Metal Ground. Connect the other negative clamp to the metal ground of the vehicle with the dead battery. You can use the engine block or another metal surface of the vehicle away from the battery. This is the last connection you need to make.

Why do you ground the negative jumper cable?

The reason for connecting the negative cable to ground rather than to the negative terminal of the dead battery is to minimize the chances of a spark near the battery, where there may be potentially explosive gasses. Disconnect the cables and attempt to start the car with the bad battery.