I left the center one off because it's the high voltage lead that goes to the center terminal of the distributor cap, which then branches off to the 4 spark plugs by way of the rotating rotor underneath. In terms of wiring the circuit I didn't feel it was necessary because that to me is a given. I've included it to the coil here:
Thanks for adding the 3rd connection to the coil!
I have an electronics background, not an engine or automotive background.
My goal is to see of FULL schematic of the ignition system so I can understand it from an electronics standpoint.
I found some schematics for the insides of an ignition "coil", which is really a transformer, in electronics terminology.
Transformers have to at least 2 coils (windings) inside.
There's a really good description of how the points system works, complete with an animated graphic of the distributor.
http://auto.howstuffworks.com/ignition-system4.htmIt also includes a very important piece of information - spark is not generated until the points (which are normally closed) are opened.
From the schematics, I can now see that when the points open, the capacitor (condenser) is allowed to charge from 0V to 12V, pulling a pulse of current through the primary coil of the transformer, which then induces a high Voltage in the secondary coil of the transformer, which is then passed on to the spark plugs.