Thankfully, the positive and negative on a car battery can easily be identified. The top of the positive terminal is marked with a plus (+) sign and may also have red wires or a red cap/ring around it. The negative terminal is marked with a negative (-) sign.
If you cannot find a plus (+) or negative (-) sign on the terminals—and do not see any red wires or markings on the terminals indicating it is the positive terminal—you can still identify the positive terminal by looking at its size. The positive terminal is larger than the negative terminal.
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