How to disconnect the battery
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Joined: Sep 2022
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2004 Infiniti g35
Battery spark....
A spark occurs when a circuit is completed where a voltage potential is present. That initial rush of current causes a spark and if you make and break the connection, sparks will increase.
When the ground is removed from the battery, it takes the entire car body out of the circuit so that an accidental contact with any metal part of the car cannot cause a spark or damage what you are working on while you are doing your project.
Whether you are touching the car body or not is irrelevant.
When the ground is removed from the battery, it takes the entire car body out of the circuit so that an accidental contact with any metal part of the car cannot cause a spark or damage what you are working on while you are doing your project.
Whether you are touching the car body or not is irrelevant.
"One thing you need to remember is the correct order when connecting / disconnecting the battery cables. When disconnecting the cables, disconnect the ground first. When reconnecting, connect the ground last.
The reason for this is that electricity travels Negative to Positive.
BANNED!!!
Joined: May 2017
Posts: 14,837
Likes: 2,497
From: Washington State
Coupe 6MT Premium RAS
That's not true.
Positive side is a big pile of extra electrons, negative side is a hole that can be filled with electrons.
The negative side WANTS to be filled up with electrons, it's creating the pull, however the movement is from the big pile of electrons on the positive side towards the hole on the negative side.
The only reason you disconnect the negative side first is if your wrench on the negative battery terminal touches chassis ground... nothing happens, it's already grounded. If your wrench is on the positive terminal first and you touch chassis ground BOOM! You just arced out your battery and probably blew some fuses or your computer.
Positive side is a big pile of extra electrons, negative side is a hole that can be filled with electrons.
The negative side WANTS to be filled up with electrons, it's creating the pull, however the movement is from the big pile of electrons on the positive side towards the hole on the negative side.
The only reason you disconnect the negative side first is if your wrench on the negative battery terminal touches chassis ground... nothing happens, it's already grounded. If your wrench is on the positive terminal first and you touch chassis ground BOOM! You just arced out your battery and probably blew some fuses or your computer.
Joined: Dec 2003
Posts: 677
Likes: 89
From: Rhode Island
One owner 2004 G35 Coupe 6MT
Oooh, an electron flow theory vs. conventional flow theory discussion on G35 Driver. 
When I went to college (many years ago) electron flow theory had replaced conventional flow theory; which is that the electrons flow positive to negative within the battery, therefore negative to positive in the circuit.
When I went to college (many years ago) electron flow theory had replaced conventional flow theory; which is that the electrons flow positive to negative within the battery, therefore negative to positive in the circuit. 
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