Q:

When connecting a battery with red and black wires, which one is negative?

A:

Quick Answer

When connecting a battery with red and black wires, the black wire is typically the negative one, according to Pep Boys. The red wire is usually the positive.

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Full Answer

According to Pep Boys, connection terminals at both ends must be checked before making a connection. Even more important than the color of wires are the actual connections themselves. Regardless of the wire colors, the positive terminal should be marked with a "+" symbol. Reversing the connection by hooking positive to negative can cause a reverse in polarity, damaging the battery or the system that is being connected. Reversing the polarity may create a shock hazard.

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