Ignition System - TOYO DENSO Electronic: Operation
The reluctor, secured to the distributor rotor shaft by a roll pin, turns with the distributor shaft. As it turns, its 4 external teeth come in line with the 4 teeth of the ring-shaped stator.
As the reluctor approaches and passes the stator teeth, variations occur in the magnetic field around them. This causes the pick-up coil to signal the ignitor.
As these signals are received, transistors inside the ignitor are turned off and on. This results in a magnetic field building and collapsing in the primary circuit of the ignition coil. When this field collapses, a voltage surge occurs in the secondary circuit of the ignition coil.
When this occurs, a high voltage spark is fed from the coil, through the distributor rotor and cap to the secondary wiring and spark plugs.