Well well,Dell . The term' condenser' was coined long before the theory of it was understood . It is now properly called a 'Capacitor '. When the points are closed -- it is effectively out of the circuit --shorted out . When the points 'open ' the magnetic field that was produced in the primary of the coil, collapses . This collapsing magnetic field , produces a current in the secondary coil -- the high tension coil. Since there are many ,many more turns in the secondary coilthan the primary, a higher voltage is produced The Capacitor is now switched into the circuit with the opening of the points and provides a 'ground'for the high tension coil . It in effect shorts out the points for this secondary circuit . The circuit is then --the coil secondary (current source) , the spark plug gap and the capacitor . At this time ,there is no current from the battery. To have any other "theories" on this very simple circuit , is very misleading and fraught with error .Lets get it straight .
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