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Should the positive or negative terminal be disconnected first when removing a car battery?

1 Answers

CassandraRose

07/29/25 2:15pm

When removing a car battery, disconnect the negative terminal first, followed by the positive terminal. Here are the relevant details: 1. The installation sequence is the opposite - connect the positive terminal first and then the negative terminal when installing. If the positive terminal is disconnected first and comes into contact with any metal part of the car body (creating a direct connection between positive and negative), it may cause a short circuit, potentially damaging both the battery and wiring. Similarly, if a metal wrench accidentally touches the car body while tightening the positive terminal connection, it could also lead to battery short-circuiting. 2. Automotive electrical systems are characterized by low voltage, direct current, single-wire system, and negative grounding. The single-wire system with negative grounding means the vehicle's metal body serves as the common negative terminal for all electrical equipment and is connected to the battery's negative terminal.

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