The negative terminal of a battery is connected to the chassis of the car and as a consequence it is grounded.
Positive and negative car battery terminals.
The math can get a little complicated but the main reason that you can safely touch the positive and negative terminals of a typical car battery and walk away unscathed has to do with the voltage of the battery.
A negative terminal is the grounded terminal on a car battery typically marked by a minus sign.
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I am assuming you are referring to installing a battery not performing a jump start.
If you first connect the negative cable then when you connect the positive cable there is a chance the wrench will complete a circuit.
It is only a safety issue.
There are also positive and negative cables in the jumper cable set.
And of course always reconnect the ground last.
Find the batteries and their terminals.
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When disconnecting a battery the negative terminal is disconnected first to cut off the circuit and avoid a short.
One is marked positive the other negative.
Each battery has two metal terminals.
Here s how it s done.
Subsequent shorting of the positive terminal to ground will then produce no current flow because the current has no return path to the negative post.
The grounded terminal connects to a grounded source on the vehicle.
While car batteries technically have the amperage to kill you the voltage is a different story.
The red one is positive the black one is negative.
That is why the negative terminal is called the ground terminal.
The other terminal is positive usually color coded red or orange and marked with a plus sign.
It is usually color coded black.