Disconnect the Positive or Negative Terminal When Removing a Car Battery?

1 Answers
DeGenevieve
07/29/25 9:05pm
The correct removal procedure is to disconnect the negative terminal first. If the positive terminal is removed first, a short circuit may occur. A short circuit refers to the direct connection of the positive and negative terminals without any resistance. The phenomenon of sparking can occur for the following reasons: 1. If only the positive terminal is removed, a conductive metal object (such as a tool) coming into contact with the car body and the positive terminal will directly connect the positive and negative terminals, allowing a large current to flow and causing a short circuit. 2. If the negative terminal is disconnected first, no current will flow, so a short circuit will not occur unless a tool connects the positive and negative terminals together.
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