This question already has an answer here:
I was wondering what the arguments would be besides the chance of explosions, or mishaps when a potential spark could ignite volatile gases. I already know of that potential liability so I don't need any clarification on that topic.
But someone else on a different, but similar question on StackExchange stated that:
"...the return current does not have to travel through the dead battery's minus terminal hookup cable and then to the jumper cable, but can go directly from the chassis ground to the jumper cable."
"A more direct return path allows for better current flow and less voltage drop, like plugging a big appliance directly into an outlet, rather than via an extension cord."
But what does that even mean? Hooking up the negative jumper cable to the negative terminal on the dead battery makes more sense instead of the ground because the clamps would be directly on the dead battery terminal. Wouldn't that be a more direct return path versus grounding it to the vehicle chassis?
This is not a duplicate of another question. This question is asking why is the ground used instead of the negative battery terminal when jumping a car. The previous question is asking why do negative cables NOT SPARK/ARC when disconnecting/reconnecting. I'm guessing nobody is even reading questions anymore.