Tools & materials
Tools
- Eye protection
- Gloves
- Correct wrench
Parts / materials
- Terminal protector if specified
Preparation
- Switch everything off, remove the key, and verify the maker’s disconnect procedure.
Step by step
- 01Identify positive (+, usually red-covered) and negative (−, usually connected to body ground).
- 02Disconnect the negative terminal first and isolate it so it cannot spring back.
- 03Disconnect positive only if removal is required. Secure the battery upright.
- 04Reconnect positive first, then negative. Tighten securely without crushing the posts.
- 05Restore required settings and verify normal starting and warning-light behavior.
What success looks like
Terminals are secure, polarity is correct, and the vehicle starts without abnormal warnings.
Common mistakes
- Reversing polarity
- Letting a tool bridge positive to metal
- Working on a swollen or leaking battery
Call a professional
Use a professional for high-voltage systems, inaccessible batteries, persistent corrosion, or required electronic registration.