I'm not sure I've read it that way, but keep this in mind. You disconnect the negative terminal, and decide to go ahead with >changing the starter for example. All it takes is a magical ground connection from your socket wrench to the chassis, or any other >ground in the car, and - gentlemen start your engines..
It doesn't work that way. If the negative terminal on the battery is disconnected there is no path for current to flow. If your wrench touches the chassis nothing happens as the chassis is no longer connected to the battery negative. You have to have a complete path for current to flow.
It is recommended that you unhook the negative post first because if your wrench were to touch the chassis and the positive post at the same time while the negative terminal is still connected then you would have a complete path and lots of excitement. A shorted battery can cause a lot of damage to the car and the person standing there.
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