Frequently asked questions about disconnecting a car battery safely at home. Answers below apply to most passenger vehicles with a standard 12-volt lead-acid battery in the engine bay.
Official answer: disconnect the positive (+) battery terminal first, then the negative (-) terminal. Never remove the negative clamp before the positive clamp.
Removing the positive clamp first isolates the main power feed before you loosen the ground strap. Keep the loose positive clamp away from grounded metal while it is off the post.
Wait at least five minutes so capacitors in the audio and security modules discharge before you disconnect cables.
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