There is some mystery about the ground side of the circuit among many technicians today. Why is that? The mystery is caused by thinking of positive current flow in circuits rather than negative current flow. Positive current flow states that current flows from the positive (+) terminal to the negative (-) terminal of the voltage source to explain how "current" flows through a circuit. Since the positive post of the battery is the post that produces sparks when it contacts ground, technicians assume that is where the "juice" is. They note that if you ground the negative post of the battery, it doesn't cause sparks to fly because there is no "juice" there.
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