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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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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