# Quick Answer: What Happens If You Put The Wrong Terminals On A Car Battery?

## What happens when you put the wrong terminals on a battery?

Jumper cable wires are not designed to take on a lot of heat and placing the cables wrong will melt its insulation exposing the bare wire.

This may lead to even more sparks when bare wires make contact with one another.

In extreme cases, the battery can crack, ignite, then explode..

## What happens if you connect the negative terminal first?

If you first connect the negative cable, then when you connect the positive cable there is a chance the wrench will complete a circuit between the battery and the chassis of the car. … If the battery is offgassing, the spark could ignite those gases causing an explosion.

## What happens if you connect positive to negative?

Battery to Battery When the battery cables are hooked up with the negative to the positive and positive to the negative terminals, the battery can explode. This is true for the battery being charged and the battery in another car being used to supply the charge.

## What happens when you connect the positive and negative ends of a battery?

When a wire is connected to the two terminals of the battery, the current flows from the positive to the negative terminal of the battery. … On the other hand, if just two wires are just connected to the terminals, there will not be any current flow. A complete closed loop only would constitute a current flow.

## 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.

## Does it matter what order you put jumper cables on?

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. Once the cables are properly connected, power on the jump starter.

## What would happen if you connect a car battery the wrong way?

When a car battery is connected backward a fuse designed to protect vehicle electronics should blow. … It is not common to damage the Engine Control Unit / Module by connecting the battery cables incorrectly. Most of them are designed to withstand reverse polarity.

## What happens if you put jump leads on the wrong way?

When you jump start your car the wrong way, there are many things that could possibly happen. The battery, jumper cables, and electronics will be damaged, including the fuse and the sensors. There is even a risk of explosion when the problem is at its worst. … In most instances, you need to check the fuse.

## Can you kill a car battery by jump starting?

This usually happens either because the jumper cables are too short or because one or both vehicle’s batteries are located in awkward locations in the engine compartment. Regardless, if you’re unable to jump your friend’s battery without touching your car to theirs, then you’re going to risk killing your own battery.

## Do you connect positive to positive?

Connect the other positive cable clamp to the positive (+) terminal of the charged battery.

## Do I hook up the negative or positive first?

Safety: Always remove the negative cable first, then the positive cable. When you connect the battery, connect the positive end first. So the order is: Remove black, remove red, attach red, attach black.

## Why does my battery spark when I try to jump it?

The inductance may have crumpled when the power supply is turned off and can generate a hundred volt spark. In any phase, you get the spark while pursuing the jump-start, carefully clasp up the red jumper cable to the positive terminal of the fine battery and other to the positive terminal of the bad battery.