![]() Conclusionĭisconnecting the battery may seem like a simple job – you just undo the terminals and remove the cables. ![]() In addition, a sudden burst of electricity may give you an electric shock or cause a battery explosion. The result of this would be a dead battery and possibly fried electronics. This is because a piece of metal, such as a wrench, that accidentally bridges the battery post and chassis’ metal parts would cause a short circuit. It is not OK to just disconnect the positive terminal, nor it’s wise to do this first when removing the battery. This just indicates that you re-established the electrical circuit. Give both connectors a strong wiggle to ensure that they are properly seated for the best connection.ĭon’t be alarmed if you see a small spark when you put the negative cable back on. Remember to install the positive cable first and always end with the negative. Once you are ready to reinstall the connectors, you can remove them from the zip ties. Just make sure you don’t let them touch anything made from metal. Some people choose to use a plastic zip tie or another item to attach them temporarily somewhere out of the way. However, it’s also just as important that the connectors don’t touch each other or anything else while you have them disconnected. That’s why the negative cable should always be the first off and last back on. It can also give you one heck of a shock. As an example, if you were to drop a metal tool on the positive terminal and it also touches anything metal on the vehicle, you could create a circuit. If you fail to remove the negative connection from the battery first, you put yourself at risk of an electrical short. RELATED: Battery Terminal Corrosion Causes (How to Fix & Prevent It) Why Disconnect Negative First? Once that is complete, you are ready to connect the negative terminal last. With these guidelines in place, you must connect the positive terminal first. If you follow the steps you took to remove the terminals, you would simply do everything in reverse order. When you are putting a new battery in or have finished jump starting it, you have to be careful to reconnect it appropriately. The negative battery cable should be reconnected last and the positive cable first. RELATED: 6 Symptoms of a Bad Ground Strap (Negative Battery Cable) Which Battery Cable Should Be Reconnected Last? Don’t let it touch the battery or the positive terminal. When you remove the negative cable, you want to put it aside. Just make sure the socket never touches both of the terminals at the same time, or you will create an electrical pathway. Turn your wrench counter-clockwise, and it should loosen. To disconnect the battery cable, you will need a socket wrench, typically 10mm. You must take proper battery precautions to keep everyone safe. If you take the positive off first, you could create an electrical short and there is a risk of sparks, especially if anything metal touches the area. The negative cable should always be removed first and reconnected last. Which Battery Cable Should Be Removed First? If you are really lucky, your car will include both symbols and colors, making it easier to identify. In this case, red indicates a positive terminal, while the black cap shows you where the negative terminal is. There’s also the chance that the caps are color-coded. ![]() If the terminals are marked, you will see a plus sign on the positive terminal and a minus sign where the negative terminal is. ![]() The battery terminals in your car should be either marked or color-coded.
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