Quick Answer: Which side do you take off first when removing a car battery?

When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.”

How do I disconnect my car battery?

First, unbolt the negative battery cable and disconnect it by lifting it free. It might take some wiggling and twisting to pull it off. Be sure never to let the wrench touch both the negative and positive terminals at the same time.

Why do you take the negative terminal off first?

Negative first

It’s important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first.

What happens if you connect the negative terminal first?

Negative pole first: Whole car (except a few parts like the positive pole) are connected. Any mistake with the other lead will lead to a short. … If you mess up by touching the car with the other lead nothing will happen.

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Should I disconnect my car battery when not in use?

“If someone is going away for a few months over the winter, they should definitely disconnect the battery. It’s the only way to prevent battery drain,” Rashidi said. … I would recommend taking the negative battery post out, and wrapping something around the end so it doesn’t touch anything while you’re not there.”

What happens when you disconnect car battery?

Disconnecting your car battery will not cause any permanent damage to your computer or ECU (electronic control unit), but it can have some adverse effects. Those include canceling your preset radio stations, forgetting learned shift points, and your car’s ideal fuel/air mixture.

Should I remove positive or negative first?

When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.” When you are replacing your car battery, It isn’t always easy to remember the order in which to disconnect and reconnect the terminals.

What happens if you don’t disconnect the negative battery cable?

Contact between the negative battery terminal and the battery, even if the cable is not clamped onto the battery, may reactivate the electrical system within the car. This would negate all the reasons you have done this much work to ensure the cable is disconnected. … Usually the cables are about 1 foot or so in length.

Why do you connect the positive terminal first?

Connect positive first, negative having less potential won’t arc. The higher the voltage, the greater the chance of arcing and fusion. On a car if negative first and you are touching any metal part of car, when attaching positive there is possibility of arcing through you. Your body becomes part of the circuit.

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Can you just disconnect the positive terminal?

cosmic charlie said: You will be fine. Disconnecting either cable works. The reason they say to disconnect the negative and not the positive is because while taking the positive connection off with a wrench if you happen to touch anything with the wrench while it’s on the positive terminal it can arc and be dangerous.

What happens if you connect positive to negative on a battery?

Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries. … The heat can melt internal and external battery parts, while the pressure from the hydrogen gas can crack the battery casing.

Does it matter what order you take jumper cables off?

Disconnect the cables in the reverse order: First remove the negative cable from the car you jumped, then the negative cable from the car with the good battery. Then remove the positive cable from the car with the good battery (don’t touch a grounded part of either car with the clamp of the positive cable).

What is the correct order to connect jumper cables?

Attach the red jumper cables first. Start by clamping one red cable to the positive side of the battery that won’t start. Then attach the other red clamp to the positive side of the working battery. Next, clamp one black cable to the negative side of the working battery.

Does the order of jumper cables matter?

It is important to connect the cables in that order, and it is safest to connect the negative (black) clamp as far from the battery as possible, in order to reduce the risk of sparking that could cause a fire or explosion.

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