Connect the positive + cable first and negative - last. When disconnecting them disconnect the negative - first and positive + last.
There is a danger in disconnecting a cars battery if your wrench grounds while disconnecting the positive terminal while the ground is still attached. It is advisable to disconnect the negative terminal first. When reconnecting the battery ( or new one ) connect the positive cable first. Also be careful to get the polarity correct or you may damage electronic components.
Disconnect the negative cable first when disconnecting a car battery
Disconnect the negative cable first when disconnecting a car battery
Remove the ground or negative cable first when disconnecting your car battery.
Connect the Positive + battery cable to the positive + battery post first. Then connect the Negative - cable to the negative - battery post.
Positive goes on first.
First off you must have the same type batteries. Connect the positive post of the first battery to the positive post of the second battery. Then connect the negative post of the first battery to the negative post of the second battery. Now connect the positive post of the first battery to the positive connection on the vehicle. Then connect the negative post of the first battery to the negative cable of the vehicle. Click the link for a diagram.
Disconnecting Auto Battery Terminal ConnectorsYes, it is safe to disconnect a "car" battery while it's raining, IF you do it properly.When disconnecting a vehicle battery, raining or not, ALWAYS disconnect the NEGATIVE [--] terminal first, and when reconnecting, always connect the NEGATIVE terminal last.
Posittive first then the negative
The man said it Always connect the positive + cable first to the battery. Then connect the negative- cable to the engine somewhere. Never connect the negative cable to the battery itself. Batteries vent hydrogen gas and which can ignite with the slightest spark. For this reason never, ever, connect the negative first and never connect the negative to the battery.
disconnect the negative (black) first then positive (red).