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Primary winding
1
Ignition
coo
I
Secondary winding
CALIFORNIA
MODELS
The
ignition
circuit
consists of
igni
tion
switch
transistor
ignition
unit
distributor
wiring
spark
plugs
and
battery
The
distributor
is of the contactless
type
and
is
equipped
with
a
pick
up
coil which
electrically
detects the
igni
tion
timing
signal
in
place
of the
circuit
breaker of the conventional
distributor The
transistor
ignition
unit
is
a
new
addition
which
generates
the
signal
required
for
the make
and break
of the
primary
electric
current
for the
ignition
coil
The
circuit
is
equipped
with
a
resistor
During cranking
electrical
current
bypasses
the
secondary
resis
tor
thereby connecting
the
ignition
coil
through
the
primary
resistor
This
makes
battery voltage
available
at
ef
ficiently
and
keeps ignition voltage
as
high
as
possible
The
primary
resistor
selVeS
to
pro
tect
transistor
ignition
circuit
The low
voltage
current
is
supplied
by
the
battery
or
alternator and flows
through
the
primary
circuit
It consists of
the
ignition
switch
Engine
Electrical
System
resistor
primary winding
of the
igni
tion
coil
transistor
ignition
unit
and
all
connecting
low
tension
wiring
The
high voltage
current
is
pro
duced
by
the
ignition
coil and
flows
through
the
secondary
circuit
result
ing
in
high
voltage
spark
between the
electrodes of the
spark plugs
in
engine
cylinders
This
circuit contains the
secondary
winding
of the
ignition
coil
distribu
tor
high
tension
wires
to
coil and
spark
plugs
distributor
rotor
and
cap
When the
ignition
switch is turned
on
and the
distributor reluctor
rotates
the
primary
current
flows
through
the
primary
winding
of
the
coil
and
through
transistor
ignition
unit
to
ground
When
the
prim
ary circuit is
opened
by
circuit
of
transistor
ignition
unit
the
magnetic
field
built up
in the
primary winding
of the coil
moves
through
the
secondary
winding
of
the
coil
inducing high voltage
This
high
Battery
Primary
Secondary
I
Resistor
To
starter
r
Transis
tor
ignition
unit
I
I
Pick
up
rcoil
r
Rotor
head
nl
J
R5
U1f
1
Retuctor
r
o i
l
f
S
park plugs
voltage
is
produced
every
time
the
primary
circuit opens
The
high
voltage
current
flows
through
the
high
tension wire to
the
distributor cap
then the
rotor
distri
butor
cap
then
the rotor
distributes
the
current to
one
of the
spark plug
terminals
in
the distributor
cap
Then
the
spark
occurs
while
the
high voltage
current
jumps
the gap
between the insulated electrode and
the
ground
side electrode of the
spark
plug
This
process
is
repeated
for each
power
stroke
of
the
engine
The
spark
plug
should
be
inspected
cleaned
and
regapped
at
tune
up
Spark plugs
should also
be
replaced
periodically
as
specified
in
the
Main
tenance
Schedule
The remainder of
the
ignition
com
ponent parts should be
inspected
for
only
their
operation
air
gap of distri
butor
tightness
ofelectrical terminals
and
wiring
condition
Apply
grease
NLGI
consistency
No
I
containing
MoS
or
equivalent
to
distributor
rotor
shaft
as
required
EE287
EE 28
Fig
EE 55
Ignition 8Y3tem
circuit
diagram
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