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It's important to wear the appropriate protective equipment any time you work on a car or truck. Car batteries contain a mixture of sulphuric acid and water that could cause serious harm if it gets into your eyes. Batteries can rupture if hooked up incorrectly, which could result in the water/acid mixture from the battery getting into your eyes. Wearing latex gloves can make it much easier to clean up after you're done working on the car, but may not be necessary for this job. It's important that you make sure the car is in park and turned off before beginning the process of replacing your battery cables. You will be working with the car's electrical system, so leaving it running could increase the likelihood of you receiving an electrical shock and could possibly do damage to the vehicle. Remove the keys from the ignition to make sure no one can accidentally try to start it while you're working under the hood. If your car is a standard, make sure the parking brake is engaged instead of having the car in park. Different automakers place the batteries in their cars in different locations for a number of reasons. Most car batteries can be located near the front or nose of the car on the left or right. It looks like a large, usually black box with two metal terminals sticking out of the top, each with cables attached. Make sure the hood struts can support the weight of the hood before you release it, otherwise it could fall and hurt you. If you cannot locate the battery under the hood of the car, it may be in the trunk. Some automakers place the battery in the trunk to improve weight distribution or save space. If you cannot locate your battery, refer to your owner's manual. It will show you how to locate and access your battery. Once you have located the battery, you will need to differentiate between the positive and negative terminals. Car battery cables are usually colored to match their use: red cables are positive, black cables are negative. In some cases, the wires may both be black, but they will have red and black boxes or accents at the ends of the cable. If there are no discernible colors visible, you can easily determine which is the negative cable by following them from the battery to the other end. Negative cables bolt directly to the body of the car or engine block, positive cables attach to the starter. The battery will have labels marked with a + and a sign. The plus is the positive cable terminal, the is the negative.
Put on safety glasses and gloves. Ensure the car is turned off. Locate the battery. Determine which is the positive and which is the negative terminal.