Ignition System General Description Ignition System Schematic (1) Battery. (2) Ignition switch. (3) Coil. (4) Distributor. (5) Spark plug. The ignition system has battery (1), ignition switch (2), coil (3), distributor (4) with inner electronics circuits and spark plugs (5). The battery and ignition switch have terminals and closed contacts to permit battery current flow through the ignition system. These components must have closed current connections to complete the operation of the ignition circuit. Coil (3) and spark plugs (5) are of the standard type. The ignition coil changes the low voltage current into high voltage current to make a spark at the gap of the spark plug.
The coil has two windings around a soft iron core. The primary has a small number of turns of heavy wire, and the secondary has many thousand turns of a very fine wire. The primary winding is on the outside of the secondary windings. The distributor has a sensor (6), trigger wheel (7) with lobes and the electric circuit that is a sealed unit inside the distributor housing. Distributor Components (6) Sensor. (7) Trigger wheel G643(E) Service Manual Chapter 4. Engine Electrical System 112