1977 DATSUN PICK-UP alternator

Engine
Electrical

System

B

v

W

WR

WL

L2
VOLTAGE
REGULATOR

co

LW

I
P
B

r

FUSIBLE
LINK

m
I
WLI

LW

cJ

I

B

t
EARTH
POINT
m
WR
WR

CHARGE

g
00
WARNING
lAMP

00000

Equipped
with

cooler
I
I
I
I

TjT
m

CLB

W

WB
B
YWR

I
I
I
I

1
W

B

rn

ALTERNATOR
I

l
LW
BW

j
J

M
IG
I

W

BwtIl

IGNITION
SWITCH

COLOR
CODE

B
Black

OW
Black
with

white

stripe

W
White

WB
White
with
black

stripe

WR
White
with
red

stripe

WL
White
with
blue

stripe

LO

Blue
with

black

stripe

LW
Blue
with
white

stripe

Y
Yellow
lOA

C
o
0
0
0

o
0
0
FUSE

BLOCK

M
0
0
0

lOA

Ii

California
models

E
E492

Fig
EE
25
Circuit

diagram
of
charging
lfY
t

m

EE
14

DESCRIPTION

REMOVAL

DISASSEMBLY

INSPECTION
AND
REPAIR

ROTOR
INSPECTION

INSPECTION
OF

STATOR

DESCRIPTION

In
the
alternator
a

magnetic
field
is

produced
by
the
rotor
which
consists

of
alternator
shaft
field
coil

pole

pieces
and

slip
rings
The

slip
rings

pressed
in
the
shaft
conduct

only
a

small
field
current

Output
current
is

generated
in
the
armature
coils
located

in

the
stator
The
stator
has
three

windings
and

generates
three

phase

alternating
current
Silicon
diodes
act

@God

A
tfff
Engine
Electrical

System

ALTERNATOR

CONTENTS

EE
15

EE
16

EE
16

EE
16

EE
17

EE
17
INSPECTION
OF
DIODE

INSPECTION
OF
BRUSH

SPRING
PRESSURE
TEST

ASSEMBL
Y

ALTERNATOR
TEST

SERVICE
DATA
AND
SPECIFICATIONS
EE
17

EE
1B

EE1B

EE

1B

EE19

EE
19

like
a
one

way
valve
for

electricity
so

that

charging
current

passes
easily
but

reverse
current
is
shut
out

In
this
alternator

pack
type
silicon

di
odes

are
used

Six

diodes
three

negative
and
three

positive
are
installed
in

positive
and

negative
plates
as
an

assembly

These
diodes
are
direct
soldered
at

their

tips
and
constructed
with

posi

3

2

I
4

e

o

e

9
tive
and

negative
conjunction

They
are
mounted
on
the
two

plates
which

combine
the
function
of

heat

dissipating
plate
and

positive

negative
terminals
and
are

light
in

weight
and

easy
to
service

The

pulley
mounted
on
the
air

conditioner
models
is

different
from

that
on
the

standard
models
without

air
conditioner

1

Pulley
usem

bly

2
Front
cover

3
Front

bearing

4

Rotor

5

Rear

bearing

6
Stator

7
Brush
assembly

8
Rear
cover

9

Diode
set

plate
assembly

10
Diode
cover

11

Through
botrs

EE
15
EE345

Fig
EE
26

Exploded
view

REMOVAL

1
Disconnect

negative
battery
ter

minaL

2

Disconnect
two
lead
wires

and

connector
from
alternator

3
loosen

adjusting
bolt

4

Remove
alternator
drive
belt

5
Remove

parts
associated
with

alternator
from

engine

6

Remove
alternator
from

vehicle

DISASSEMBLY

1
Remove

pulley
nut
and

pulley

assembly

11

C

@@@
EE033

Fig
EE
27

Removing
pulley
ond

fan

2
Remove
brush
holder

fIxing

screws
and
remove
brush
holder

cover
Pull
brush
holder
fOIWard

and

remove
brushes

together
with
brush

holder

Note
Do
not

disconnect
N
tenninaJ

from
stator

coil
lead
wire

EE346

1
N
terminal

2
Brush

holder

3
Brush
holder

co
r

Fig
EE
28

Remouing
brush
Engine
Electrical

System

3
Remove

through
bolts

Separate

front
cover
with

rotor
from
rear
cover

with
stator

by
lightly

tapping
front

bracket
with
a

wooden
mallet

J

J

4

C

EE035

Fig
EE
29

Separating
front
cover

with

rotor

from
rear

cover

4
Remove
three
set

screws
from

bearing
retainer

and

separate
rotor

from
front
cover

DO
Q
EE036

Fig
EE
3D

Removing
rotor

5

Pull

rear

bearing
out
from
rotor

assembly
with

a

press
or

bearing

puller

L

I
EE037

Fig
EE
3I

Pulling
out

of
roar

bearing

EE
16
6
Remove
diode

cover

fIXing
screw

and

remove
diode

cover
Disconnect

three
stator

coil
lead
wires
from

diode

terminal

with
a

soldering
iron

7
Remove

A
tenninaJ
nut
and
diode

installation

nut
and

remove

diode

assembly

CD

AJ

f
e

ecA

O

1
Diode

assembly

o

2
Diode
cover
o

EE039

Fig
EE
32

Removing
diode

088embly

Note
Use
care

in

assembly
to

on
it
handling
diode

an

undue

st

INSPECTION
AND

REPAIR

Remove

alternator
from
car

and

connect
a
circuit
tester
between
F

tenninal
and
E
terminal

When
the
resistance

is

approxi

mately
5il
the
condition
of

brush
and

fIeld
coil
is

satisfactory
When
no

continuity
exists
in
brush
or
fIeld

coil
or

when
resistance
differs

significantly
between
those

parts
dis

assemble
and

inspect

A

o
E

O

1

ld

Q

EE040

Fig
EE
33

Inspecting
alternator

If
current
flows
in

both

positive

and

negative
directions
diode
is
short

circuited
If
current
flows
in
one

direc

tion

only
diode
is
in

good
condition

Test

probe
of
a
circuit

t
ter

e

Gl

terminal

EEl

plate

EJ
plate
terminal

terminal

e
plate

e

plate
terminal

e

plate
@
plate

Xl

plate
e
plate

INSPECTION

OF
BRUSH

Check

movement
of
brush
and

if

movement
is

not
smooth
check

brush

holder

and
clean
if

necessary

Check
brush

for
wear
If
it
is

worn

down
to
less

than
the

specified
limit

replace
brush

assembly

Check
brush

pig
tail
and
if

dam

aged
replace

Brush

wear

limiting
line

EE127

Fig
EE
41
Bnlsh
wear

limil
Engine
Electrical

System

If
there

is
a

faulty
diode

replace
all

diodes
ix

diode
as
an

assembly

See
table

below

These
diodes

are

unserviceable

Conduction

o

o

o

SPRING

PRESSURE
TEST

With
brush

projected

approximate

ly
2
mm
0
079
in

from
brush
holder

measure
brush

spring
pressure
by
the

use
of
a

pring
balance

Normally
the

rated

pressure
of

a
new
brush

spring
is

255

to
345

gr
9
0
to
12
202

Morevover
when
brush
is
worn

pressure
decrease

approximately
20

g

0
7
02

per
1
mm

0
0039
in

wear

t

m
0
079

in

or
f

EEO
9

Fig
EE

42
M
CJ

uring

pring
preaure

EE

lB
ASSEMBLY

Reassemble

alternator
in
the

reverse

sequence
of

disassembly
noting
the

following

I

When

soldering
each

stator

coil

lead
wire
to
diode

assembly
terminal

carry
out
the

operation
as
fast

as

pas

sible

2
When

installing
diode
A

terminal

install

insulating
bush

correctly

1

Imulating
bush

2

A

terminal
bolt

3
Diode

cover

4
Rear

cover

5
Diode
a

sembly

EE347

Fig
EE

43
Sectional
view

of
diode

and
A
term
inal

3

Tighten
pulley
nut
with

tighten

ing
torque
of
3
5

to
4

0

kg
m
25
3

to

29
0
ft
Ib

When

pulley
is

tightened

make

sure
that
deflection
of
V

groove

is

less
than
0
3
mm

0
01
IS
in

q

ffl
t
EE051

Fig
EE

44

Tightening
pulley
nut

Engine
Electrical

System

ALTERNATOR
TEST

Before

conducting
an

alternator

test
make
sure
th

tthe

battery
is

fully

charged
A

30
V
olt

voltmeter

and
suitable

test

probes
3re

necessary
for
the
test

Set

up
a
test
circuit

as
shown
in
Figure
EE45
and
test

auernator
in

the

manner
indica
ted
in

the
flow

chart

below

1
Disconnect

connectors
at
alternator

2
Connect
A

terminal
to
F

terminal

3
Connect

one

test
probe
from

voltmeter

positive
terminal
to

A
terminal

Connect
the
other
test

probe
to

ground

Make
sure
that
voltmeter

registers
battery
voltage

4

Turn
on

headlights
and

switch
to

High
Beam

5

Start

engine

6
Increase

engine
speed
gradually
until
it
is

approximately
1
100

rpm
and

take
the

voltmeter

reading

Measured
value
Below
12
5
Volts

Alternator
is
in

trouble
remove
and
check
it

for
condition
Measured
value
Over
12
5
Volts

Alternator
is
in

good
condition

Notes

a
Do
Dot
run

engine
at
the

speed
of

more
than
1
100

rpm
while
test
is

being
conducted
on
alternator

b
Do
not
race

engine

i
9
l

IV
I
Battery

EE052
Voltmeter

Fig
EE

45
Testing
alternator

SERVICE
DATA
AND
SPECIFICATIONS

Nominal

rating
V

A
LT138
IB

LTl35
36B
For
air

conditioner

1235

12
38

Negative
Negative

1
000
1

000

28
2
500

30
2
500

35
5

000
38
5
000

2
25

2
25

More
than

7
5
0
295
More
than
7
5
0
295

255

to
345
255

to
345

9
0
to

12
2

9
0
to

12
2

More
than
30
1
181
More
than

30
1
181

EE

19
Type

Ground

polarity

Minimum
revolution

when

generating

14V
with
no
load

rpm

Hot

output
current

Nrpm

Pulley
ratio

Brush

Length

Spring
pressure
mm
in

gr
oz

Slip
ring
outer
diameter
mm

in

DESCRIPTION

MEASUREMENT
OF
REGULATOR

VOLTAGE

ADJUSTMENT

VOLTAGE
REGULATOR

DESCRIPTION

The

regulator
consists

basically
of

a

voltage
regulator
and
a

charge

relay

The
voltage

regulator
has
two
sets
of

contact

points
a
lower
set

and
an

upper
set
to
control
alternator
volt

age
An
armature

plate
placed
between

the
two
sets
of
contacts
moves

upward

or
downward
or
vibrates
The
lower

contacts
when
closed

complete
the

jCV
ID@
@

GJ
I

@

@

@
Engine
Electrical

System

REGULATOR

CONTENTS

EE
20
CHARGING
RELAY

SERVICE

DATA
AND

SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Including
alternatorl

EE
25
EE
23

EE
24

EE

20

EE

23

EE
23

field
circuit
direct
to

ground
and
the

upper
contacts
when
closed

complete

the
field

circuit
to
ground

through
a

resistance
field
coil
and

produce

alternator

output

The

charge
relay
i
similar
in

construction

to
the

voltage
regulator

When
the

upper
contacts
are
closed

charge
warning
lamp
goes
on
v

1

Charge
relay

2

Voltage
regulator

EE285

Fig
EE
46
View

of
removing
cover

As

regards
the
construction
the

voltage
regulator
is

very
similar
to
the

charge
relay
as
shown
in

Figure
EE47

@

r

J
CD

@

@

@
Q
@
ID@

ID@

J
t

L

T

@
r

b
r
CD

L
@

j
1

g

f

@

@
EEJ97

J
I1Jlccting
spring

2
Y
kt

g
p

3
Armaturc

4
Core

go

5
Low

Sllccd
lnlacl

h
Point

ap

7

High
speed
conlat
t

8
Contact
c
9

3111111
0
118
ill

di

10

41l1I11W
157in
c1ia
few

II

Cuil

12

lock
nut

J3

Adjllslin
screw

14

Adjll
sting
sprin

15
Yoke
9

Adjusting
screw

10
Lock

nut

11
Coil

12
4mm

0
157
in

dia
screw

13
3mm
0
118
in

dla
crew

14
Contact

iet

15

Voltage

cgulatm
contact

a

Cnl1
Tlll
tion
f

lltagl
l

j
llIOltllT
I
Point

gilp

2

Charge
relay
contllct

3
Core

gap

4

ArlllatlJre

5

Connecting

sprin

6
Yoke

gap

7
Yoh

B

Adjusting
pring

b

Construction
of

charge
relay

Fig
EE
47
Structural
vi
w

EE
20

MEASUREMENT

OF
REGULATOR

VOLTAGE

Regulator
voltage
is
measured
with

regulator
assembled
with
alternator

When

measuring
voltage
with

regulator

mounted
on

car
it
is

necessary
to

rotate

engine
at

high
speed

Connect
DC
voltmeter

l5
30Y

DC

ammeter

l5
30A

battery
and
a

O

25fl

resistor
rated

at
25W
with

cables

as
shown

I

Check
to
be
sure
that
all
electrical

loads
such
as

lamps
air

conditioner

radio
etc
are
turned
off

2

Before

starting
engine
be
sure
to

make
short
circuit
with
a

cable
be

tween
fuse
side
terminal
of
resistor

O
25fl

and

negative
side
terminal
of

ammeter
Failure
to
follow

this

pre

caution

will

cause
needle
of
ammeter

to

swing

violently
resulting
in
a
dam

aged
ammeter
Engine
Electrical

System

Genera

tor

A

r

iJ

IG

Fuse
box

i
B
Rqulator

Connector

Wire
harness

Short
circuit
here
between

fuse
side

tenninal
and

terminal
of
ammeter

before

starting
the
operation

Ammeter

lOA
V

Voltmeter
30V

EE055

Fig
EE
48

Measuring
regulator
voltage
with

regulator
on
vehicle

3
Refer
to
the

following
chart
to

determine
if

regulator
and
relative

EE
21
parts
are
in

good
condition

ADJUSTMENT

VOLTAGE
REGULATOR

When
regulating
voltage
as
meas

ured
above
deviates

from
rated
value

adjust
regulator
in

accordance
with
the

following
instructions

I

Inspect
contact
surface
and
if

rough
lightly
polish
with
fine

emery

paper
1
500
or
600

2
Measure
each

gap
and

adjust
if

necessary
Adjust
core

gap
and

point

gap
in
that
order
No

adjustment
is

required
for

yoke

gap

3

Adjusting
core

gap

Loosen
screw
4
mm
0
157
in

diameter
which
is
used
to
secure

contact
set
on

yoke
and
move
contact

upward
or
downward

properly
See

Figure
EE
49

Core

gap

0
6

to
1
0
mm

0
024
to
0
039
in

EE398

I
Contact

set

2
ThicknesJ
gauge

3
4

mm
0
157
in
dia
screw

4

Crosshead
Jcrewdriver

Fig
EE
49

AdjUJJting
core
gap
Engine
Electrical

System

4

Adjusting

point
gap

Loosen
screw
3

mm
O
lIS
in

diameter
used
to
secure

upper
con

tact
and
move

upper
contact

upward

or
downward
as

necessary
See

Figure

EE
50

Point

gap

035

to
0
45
mm

0
014

to
O
D1S
in

EE399

I
Thicknes

gauge

2
3
mm

0
118
in
dia

screw

3
Cro
Sshelld

screwdriver

4

Upper
contact

Fig
EE
50
Adjusting

point
gap

5

Adjusting
voltage

Adjust
regulating
voltage
as

follows

Loosen
lock
nut

securing

adjusting

screw
Turn
this
screw
clockwise
to

increase
or
counterclockwise
to

decrease

regulating
voltage
See

Figure
EE
5

J
CD

EE400

I

Wrench

2

Crosshead
screwdriver

3

Adjusting
screw

4
l
ock

nut

Fig
EE
51

AdjUJJting
rel
Ulating
voltage

CHARGE
RELAY

Nonna

relay
operating
voltage
is
S

to
IOV
as
measured
at
alternator
A

tenninal

Relay
itself
however

oper

ates
at
4
to
5V

Use
a
DC
voltmeter
and
set

up
a

circuit

as
shown
in

Figure
EE
52

Adjust
charge

relay
in

the
same

manner
as
that
for

voltage
regulator

L

Connect

positive
tenninal
of
voltmeter
to

regulator
lead
connector
N
tenninal
with

negative
terminal

grounded

2
Start

engine
and

keep
it

idle

3
Take
voltmeter

reading

o
Volt

I
Check
for

continuity
be

tween
terminals
of
re

gulator
and
alternator

2
Alternator
circuit

inopera

tive
if

continuity
exists
Below
5
2
Volts

Charge
warning
lamp
on

I
Check
fan
belt
tension

2
If
correct
remove

regulator

and

adjust
as

necessary
Over
5

2
Volts

Charge
warning
lamp
on

Charge
relay
coil
or
contact

points
out
of
order

Replace
regulator

Over
5
2
Volts

Charge
warning
lamp
off

Charge
relay
assembly
is
in

good
condition

EE
23