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. Click to see full answer. In this way, when using jumper cables which goes on first? 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. Also, why do you connect the positive terminal first? The positive terminal should be connected first when installing a new car battery to a car. If you connect the negative terminal first, the car’s entire frame becomes grounded together with the nuts and bolts of the frame. Then, which battery terminal do I connect first? Safety: Always remove the negative cable first, then the positive cable. When you connect the battery, connect the positive end first. Here is the order: Remove black, remove red, attach red, attach black.How do you use jump start cables? To safely jump a start, follow these steps: Take out your jumper cables. Place both vehicles in Park or Neutral and shut off the ignition in both cars. Attach one of the red clips to the positive terminal of your battery. Attach the other red clip to the positive terminal of the other car.