Positive and Negative ground are like right hand and left hand threads on a bolt. On the bolts the nuts turn in opposite directions. With Positive and Negative ground current flows through the circuit in opposite directions.
The battery and charging system polarity must match.
Some electrical devices (such as diodes, ammeters, charging systems, ignition coils) are polarity sensitive, meaning that they are designed so that current must flow through them in one direction. They can work with either ground polarity simply by connecting them with regard to proper current flow direction.
"Ground" is the zero voltage reference point of the circuit so ground itself is technically neither negative or positive. Negative or positive ground simply indicates which battery post is connected as the zero voltage reference
Starters, lights and switches do not care which polarity they operate.
You are not connecting your coil backwards to battery polarity, you are connecting it for proper current flow direction.
You mention being an electronics geek. Therefore I assume you have had some experience with negative voltages in electronic circuits. Guess What...........negative voltages are positive ground.
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