Think of it like this ------
You have "hot" going all over the car to run many items.... but if they aren't seeing the ground side -- then they aren't hot! Real simple.
Take a battery cable -- run it to the hot side of the battery (12V +) -- never hook up the ground side of the battery.... run around with the 12V hot wire and touch all over the car - and you'll never have a spark. Why? Because there's no path to ground.
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