jump start terminals DATSUN PICK-UP 1977 Service Manual

NON
CALIFORNIA
MODELS
Engine
Electrical

System

IGNITION
CIRCUIT

CONTENTS

EE
26

CALIFORNIA
MODELS
EE
2B

NON

CALIFORNIA
MODELS

The

ignition
circuit
consists

of
the

ignition
switch
coil

distributor

wiring
spark
plugs
and

battery

The
circuit

is

equipped
with
a

resistor

During
cranking
electrical

current

bypasses
the
resistor

thereby

connecting
the

ignition
coil

directly
to

battery
This

provides
full

battery

voltage
available
at
coil
and

keeps

ignition

voltage
as

high
as

possible

The

low

voltage
current
is

supplied

by
the

battery
or

alternator
and

flows

through
the

primary
circuit

It
consists

of
the

ignition
switch
resistor

primary
winding
of
the

ignition
coil

distributor
contact

points
condenser

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

0
cl

Battery

Ignition
coil
secondary
winding
of

the

ignition
coil

high
tension

wiring
distributor
rotor

and

cap

When
the

ignition
switch
is

turned

on
and
the

distributor
contact

points

are
closed

the

primary
current

flows

through
the

primary
winding
of
the

coil
and

through
the

contact

points
to

ground

When
the

contact

points
are

opened

by
the

revolving
distributor
earn
the

magnetic
field
built

up
in
the

primary

winding
of
the

coil
moves

through
the

secondary
winding
of
the

coil

inducing

high
voltage
The

high

voltage
is

produced

every
time

the

contact

points

open
The

high
voltage
current

flows

through
the

high
tension
wire

to
the
distributor

cap
Then
the
rotor

distributes
the
current
to

one
of
the

spark

plug
terminals
in
the
distributor

Re5istor

To

starter

Secondary

winding

Cap

Breaker

point

f

Distributor

EE
26
cap

Then
the

spark
obtains
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
distributor
contact

point
and

spark
plugs
should
be

inspected
clean

ed

and

regapped
at

tune

up
They

should
also
be

replaced
periodically
as

specified
in

the
Maintenance

Sched

ule
In

addition

apply
grease
NLGl

consistency
No
I

containing

MoS2
or

equivalent
to
distributor

shaft
and

grease
MIL
G
l0924B

containing

MoS2
or

equivalent
to
cam
as
reo

quired

The
remainder

of
the

ignition

component

parts
should
be

inspected

for

only
their

operation
tightness
of

electrical
terminals
and

wiring
con

dition

The

ignition
circuit
is
shown
below

IR

IB

I

is
21

J
g

Rotor

head

EE060

Fig
EE

53

Ignition
ydem
circuit

diagram

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
oi

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
of
electrical
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