I thought it wouldn’t matter much, but apparently there is an order for disconnecting too. My question refers to jump starting one car with the help of another.
In: Engineering
The battery might release explosive gases when charging, and disconnecting the cables under load might spark, which could ignite the gases.
So you want to disconnect negative first on the dead car, as that’s the end that should be connected to a ground point, and not directly to the battery.
Also, since electricity flows from the negative (black) to the positive (red), this way you also reduce the risk of shorting anything or doing other damage if you’re clumsy with the cables.
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