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Disconnecting Car Battery

Drift88king

By Drift88king,
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Drift88king Contributor

Drift88king

Posted
Posted

Hey Guys,

I'm leaving my Skyline R33 for around 2 months and a half and I need to disconnect the battery asap.

Is it the same as all vehicles, unbolting the negative end and the the positve?

If anyone can help me with the details I'd really appreciate it.

Thanks

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Plan-FAILURE Rising Star

Plan-FAILURE

Posted
Posted
Hey Guys,

I'm leaving my Skyline R33 for around 2 months and a half and I need to disconnect the battery asap.

Is it the same as all vehicles, unbolting the negative end and the the positve?

If anyone can help me with the details I'd really appreciate it.

Thanks

Positive off first, negative off second.

When reconnecting, negative on first, positive second.

Do that and you won't go wrong mate!

mad082 Grand Master

mad082

Posted
Posted

actually, when disconnecting the battery you should do negative first, then positive.

when reconnecting you should do the positive first and then the negative.

this means that if you happen to touch the spanner to the body while removing the positive you won't cause any problems as the car is no longer earthed.

blind_elk Grand Master

blind_elk

Posted
Posted

If you are doing it simply to prevent any discharge of the battery, then you really only need to disconnect 1 terminal. Once you have done that, there is no continuity between the terminals of the battery, and nothing can draw current from the battery.

mad082 Grand Master

mad082

Posted
Posted
Been doing it wrong for years without an issue LOL. Interesting

the only real reason for doing negative first is so that if you happen to touch the body or the motor with the spanner when undoing the positive then it won't spark, resulting in possibile blown fuses, etc.

blk94r33 Mentor

blk94r33

Posted
Posted
the only real reason for doing negative first is so that if you happen to touch the body or the motor with the spanner when undoing the positive then it won't spark, resulting in possibile blown fuses, etc.

^+1

Or welding something:

Was wiring in driving lights on a motor home, job done, wouldn't turn on.

Someone else had disconnected one positive terminal from one of the two 1000cca batteries, and secured it out of the way with, wait for it....

a piece of mig wire, to the chassis...

thinking that no one could be stupid enough to do it with a positive terminal, I reconnected the battery. 2000amps@12 volts shorted directly to earth by the mig wire, proceeded to weld itself in place, melt and in the process burn the living f*** out of my hand in a fraction of a second. Lesson learnt?

As marc said, disconnect the negative first, on the off chance that you slip with your spanner or whatever, hit any point that is earthed, and proceed to F*** S*** up.

Kinks Grand Master

Kinks

Posted
Posted

If you try and disconnect positive first and slip with the spanner you can potentially short the battery to chassis via the spanner, causing a few hundred amps to flow which will make the spanner f**king hot and your palm f**king burnt.

always disconnect the negative terminal first, it's safer.

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