G643(E) Service Manual Chapter 4. Engine Electrical System 112
Ignition System
General Description
Ignition System Schematic
(1) Battery. (2) Ignition switch. (3) Coil. (4) Distributor. (5) Spark plug.
Distributor Components
(6) Sensor. (7) Trigger wheel
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.
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