1977 DATSUN PICK-UP alternator

Engine
Electrical

System

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Including
alternator

Condition
Probable
cause

No

output
Sticking
brushes

Dirty
brushes
and

slip
rings

Loose
connections

or
broken
leads

Open
sta
tor

winding

Open
rotor

winding

Open
diodes

Shorted
rotor

Shorted
stator

Grounded
A

terminal

Broken

fan
belt

Excessive

output
Broken
neutral

wire
COIOf
of
wire
is

yellow

Voltage
fegulator
breakdown

Poor

grounding
of
alternator
and

voltage

regulator
En

terminal

Broken

ground
wire

color
of
wire
is
black

Low

output
Loose

or
worn
fan
belt

Sticking
brushes

Low

brush

spring
tension

Voltage
regulator
breakdown

Dirty

slip
rings

Partial
short

ground
or

open
in

stator

winding

Partially
shorted

or

grounded
rotor

winding

Open
or
damaged
diode

Noisy
alternator
Loose

mounting

Loose
drive

pulley

Broken
ball

bearing

Improperly
seated
brushes

EE

25
Corrective
action

Correct
or

replace
brushes
and
brush

springs

Clean

Retighten
or
soldef

connections

Replace
leads
if

necessary

Repair
Of

replace
stator

Replace
rotor

Replace

Replace
rotor

Repair
or

replace

Replace
insulator

Replace

Replace

Check

regulator
operation
and

repair
or

replace
as

required

Retighten
terminal
connection

Replace

Retighten
or

replace

Correct
or

replace
brushes
and

springs
if

necessary

Replace
brush

springs

Check

regulator
OpefatiOn
and

repair
or

replace
as

required

Clean

Replace
stator

Replace
rotor

Replace
diode

Retighten
bolts

Retighten

Replace

Seat

correctly

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

Engine
Removal

Installation

ENGINE

REMOVAL
AND
INSTAllATION

REMOVAL

INSTALLATION

ENGINE
MOUNTING
INSULATORS

REMOVAL

It
is
much
easier

to
remove

engine

and
transmission

as
a

single
unit

than

to

remove
them

separately
After
re

moval

engine
can
be

separated
from

transntission

assembly

Notes

a
Be

sure
to
hoist

engine
and

jack
up

transmission
in
a
safe
manner

b
Use

fender
cove
to

protect
vehicle

body

1
Remove

battery

2
Scribe

hood

hinge
location
for

proper
reinstallation
and
remove

hood

Note
Have

an
assistant

help
you
so
as

to

prevent
damage
to

body

3
Drain

radiator
coolant

4

Disconnect

upper
and
lower

radiator
hoses

from

engine

5

Remove

two
oil
cooler
hoses

from
lower

end
of
radiator
Auto

ma
tic
transmission

models

only

6
Remove

radiator

shroud

7

Remove
four

bolts

securing
radia

tor
and

detach
radiator

Note

Always
tighten
securing
bolt
at

upper
right
hand
side

together
with

body
harness

terminal

8

Remove
carburetor
air

cleaner
as

follows

Remove
fresh
air

duct

Remove

hot
air

duct

Loosen
air

cleaner
band

bolt
and
air

cleaner

supporting
bolts

Disconnect
air

cleaner
ta
air

pump

hose

Disconnect
air
cleaner

to
rocker

cover
hose
at

rocker

cover

Disconnect
air

cleaner

to
air

control

valve
hose
California

models

only
CONTENTS

ER
2

ER
3

ER
3
FRONT

INSULATOR

REAR

INSULATOR

TIGHTENING

TORQUE
ER
4

ER
4

ER
4

Disconnect
air

deaner
to

A
B
valve

hose

Disconnect
air

cleaner
ta

vacuum

hoses

Note

Protect
carburetor
from
dust

and

foreign
matter

by

placing
cover

over
air
inlet

opening

9

Disconnect

fuel

pump
to
fuel

fdter
hose
and
return

hose

10

Disconnect
carbon
canister

hose

on

engine
side

II

Disconnect
air

pump
air

C1eaner

to
al

p

p
hose

12

Disconnect

following
cables

wires

and
hoses

Engine
ground
cable

Accelerator
wire
at

carburetor

High
tension

cable
between

ignition

coil

and
distributor

Wire

to
distributor
at

body
ter

minal

Wire
to

oil

pressure
switch

Wires
to
thermal

transmitter

Wires
to

B
C

p
D
cut
solenoid

Non
California

models

only

auto

choke
heater
and

anti

dieseling

solenoid

Wires

to
alternator

Wires
to
starter

motor

Heater
inlet
and
outlet

hoses
if
so

equipped

Vacuum
hose
of

Master
Vac
at
in

taJce
manifold

Wires
for

back

up

lamp
switch

Cable
to

speedometer

13

Remove
transmission

control

linkage
from

transmission

Manual

transmission
models

I

Detach
rubber
boot

2
Remove
E

ring
and
control

lever

pin
from

transmission

striking
rod

guide
and

remove
control
lever

ER
2
Fig
ER
l

Automatic

transmission
models

I

Disconnect

selector

range
lever

from
manual
shaft

2
Disconnect
wires

at
inhibitor

switch
and

down
shift
solenoid

14
Air

conditioner

equipped

models
need

following

procedures

1
After

removing
flexible

hose

support
remove
four

comi
ressor

se

curing
bolts

Then
move
the

com

pressor
to

battery

support

2

Remove

vacuum
hoses
of

F
LC
D
solenoid
valve

3
Remove
F
LC

D
actuator

15
Remove
two
bolts

securing

clutch

operating
cylinder
Then
dis

connect

operating
cylinder
and

flexi

ble
tube

as
an

assembly

Manual

transmission

models

only

16
Disconnect
front

exhaust
tube

from
exhaust
manifold

17
Remove

propeller
shaft

I

Disconnect

propeller
shaft

center

bearing
bracket
from

third

crossmember

2

Disconnect

propeller
shaft
from

companion
flange
of
differential

carrier

3
Remove

propeller
shaft
from

transmission

and

plug

up
rear
end
of

extension

housing
of

transmission
to

prevent
oil

leakage

18
Attach
a
suitable
wire

or
chain

to
lift

engine

19
Remove

front

engine
mounting

bolts

at

engine
mounting
front

sup

port

Body
Electrical

System

RADIO

Noise

prevention

Position
vehicle
in
an

open
area

away
from
steel

buildings
run

engine
extend
antenna
to
its
maximum

length
set
volume

control

to
maximum
and
set
dial
at
a
medium

point
without

catching
broadcasting
wave

Condition

Ignition

system

Noise
occurs
when

engine
is

op

erated

Charging
system

Sound
of

alternating
current

pre

sents

When

accelerator

pedal
is

depressed

or

released
noise

presents

Supplement
equipment

When

engine
starts
noise

presents

Noise

still

presents
even
after

stop

ping
engine

Notes

a
Be
sure
to
locate

capacitor
as

close

as
to

noise
source
and
connect
in

parallel
Probable
cause
Corrective
action

High
tension
wire

Install
new

high
tension
wire

Ignition
coil
Install
a
0

51lF

capacitor
to

primary
side

terminal
of

ignition
coil

Note
Be

careful
not
to
install

capacitor
to

secondary
or

primary
breaker
side
other

wise

engine
becomes

improper

Install
bond

strap

Distributor
Secure
contact
of
carbon
electric

pole
and

rotor

Eliminate

sharp
tip
on

rotor

pole
or

cap
pole

by

scrubbing
with
a

screwdriver

Check

stagger
between
rotor

and
stator

Alternator
Install
a
0

51lF
capacitor
to

charging
termi

nalA

Note
Do

not

use
a
larger
capacitor

If

capacitor
is

installed
to
terminal
F

alternator
coil
will
be

damaged

Regulator
Install
a
0

51lF
capacitor
to
IGN
terminal

of

voltage
regulator

Operative
noise
of
water
tem

perature
and
fuel

gauges
Install
O

IIlF
capacitor
between
terminal
and

ground
wire

Note
If

a

capacitor
having
a

larger
capacity

is
used
indication
of

gauge
will
be
de

viated

b
Cut
lead
wire

as
short
as

possible

c

Ground
wire
should
be
attached
on

the

body

completely

d
Make
installation
and
connection
securely

e

Carefully
identify

or
OUT

mark
IN

BE
35

CD
m
Cl
@
D
@

I

j

1
To
instrument
harness
IS
To
battery
30
To
check
connector

2
To
full
transistor
amplifier
16
To
fusible
link
3t
To
headlamp
L
U
type
2

California
models
only
17
To
engine
harness
No
2
32
To
sido
marker
lamp
L
B

3
To
hood
switch
18
To
alternator
33
To
front
combination
lamp
L
H

4
To
engine
compartment
lamp
1
9
To
front
combination
lamp
R
n
34
To
horn
Low

ll
l
S
To
washer
motor
20
To
headlamp
R
H
type
2
3S
To
horn
High

l
l
0
6
To
auto
choke
heater
relay
1
To
side
marker
lamp
R
n
36
To
B
C
D
D
cut
olenoid
California
models

7
To
detector
dri
e
counter
22
To
headlamp
R
B
type
1
only

Non
Califunia
model
except
for
Canada
23
To
ground
37
To
block
tcrminal
distributor
California

8
To
ignition
relay
California
models
only
i4
To
thermal
transmitter
models
only

9
To
floor
sensor
relay
California
modeb
only
is
To
distributor
Non
California
models
only
38
To
ignition
coil
Non
California
models
only

n
10
To
inhibitor
relay
A
T
only
26
To
8
C
D
D
cut
solenoid
Non
California
39
To
condenser

t
II
To
head
lamp
relay
models
only
40
To
ignition
coil
and
resistor
@

12
To
horn
relay
27
To
fuel
cut
solenoid
California
models
only

OJ
v

m
13
To
voltage
regulator
28
To
auto
choke
heater

g
e
14
To
cooler
cable
29
To
headlamp
L
R
type
1

OJ
to

o
Q
m
r0

C
1
i

Ql
CIl
Il
l
3