Disconnect the negative (black, “-”) battery terminal first, then the positive (red, “+”) terminal.

Quick Scoop

  • Always remove the negative terminal first when disconnecting a car battery.
  • When reconnecting, do the reverse: positive first, negative last.
  • This reduces the risk of short circuits, sparks, or accidental damage to the car’s electronics and to yourself.

Why negative first?

  • The negative terminal is usually connected directly to the car’s chassis (ground).
  • If you loosen the positive first and your tool accidentally touches any grounded metal, you can create a live short, causing big sparks or damage.
  • By removing the grounded negative cable first, you “break” the circuit, so an accidental contact with the positive side is far less risky.

Simple step-by-step

  1. Turn the car off, remove key, and avoid wearing metal jewelry.
  1. Locate the negative terminal (usually black, marked “-”) and loosen/remove that cable first.
  1. Then loosen and remove the positive terminal (usually red, “+”).
  1. When installing or reconnecting, attach and tighten the positive cable first, then the negative last.

Mini example

You’re replacing a weak battery:
You pop the hood, find the black “-” terminal, remove that cable, then remove the red “+”. New battery goes in, red “+” on first, black “-” on last — and you’ve followed the safest order used in most how‑to guides and auto manuals.

Information gathered from public forums or data available on the internet and portrayed here.