When 'jump starting' a car. Connect the earth lead to the engine of the car being started.
First, theres less metal for the power to go thru to get to the starter.
Second, if you make a connection close to the battery, while its being charged, the battery is making hydrogen gas. By connecting the lead to the engine, the sparks not beside the battery & it won't ignite the gas.
Battery explosions, a close second the exploding/(imploding) CRT screens. With acid.....
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