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.

Which battery terminal connects last?

“Positive first, then negative. When disconnecting the cables from the old battery, disconnect the negative first, then the positive.

How do you connect and disconnect jumper cables?

0:110:45How to Disconnect Jumper Cables - YouTubeYouTubeStart of suggested clipEnd of suggested clipFirst we want to disconnect the negative cable from the engine. Block. Then we disconnect theMoreFirst we want to disconnect the negative cable from the engine. Block. Then we disconnect the positive cable.

What happens if you hook up jumper cables wrong?

Hooking the jumper cables up backwards can create disastrous results⁠. Possible outcomes include irreparable damage to the battery, fried electronics, and even serious personal injury. You might cause personal injury and/or damage to your car if you accidentally hook your jumper cables up wrong.