As long as this is the subject maybe it would help to explain how the system works in general terms.
The ignition system is broken down into two parts, the Primary side and the Secondary side. Spark plug wires are on the secondary side and the points and condenser are on the primary side. The two circuits come together at the coils, but at no place is there any actual mechanical contact between the two. The connection is made by the magic of electromagnetic fields.
First the Primary circuit. Power enters the system by being applied to the coils, where the little hot wire goes in. Inside the coil this wire continues in windings around a core and there are several thousand turns to this winding. Every time that wire winds around the core (which it does not touch) the voltage potential of the core will increase by the voltage in the primary wire (inversely to the amperage) when the power is surged through the system. That wire exits the coil and passes to the points and condenser. The condenser acts like a little battery that instantly discharges holding power for the surge necessary to fire the coils, the points are nothing but a switch that passes the power to ground completing the circuit. So, its power into the coils, around and around inside, then out to the points/coils, where the circuit ends in a ground.
Meanwhile back at the coil, when the power surges on because of the switching action of the points the core of the coil is energized. The amount it is energized is exactly the voltage of the power going into the coils in the primary loop times the number of loops, and the amperage divided by the number of loops. So power begins in the Secondary Circuit at the coil's core, which you can think of as the positive side, and then is passed through the spark plug wires to the plugs where it completes when it jumps the gap at the spark plug to ground.
That make sense? And before the howls begin, its very simplified.
