1977 DATSUN PICK-UP light

Fuse

M
Body
Electrical

System

YR
Meter

voltage
regulator

Water

temperature
gauge

BE261

Circuit

diagram
of
fuel
gauge
and
water

temperature
gauge

pressure
falls
below
0
4

to
0
6

kg
cm2

5

7
to
8
5

psi
Under
normal

opera

tion
when
the

engine
is

stationary
the

ligh
glows
with
the

ignition
switch

turned

on
When
the

e

gine
is

running

and
oil

pressure
reaches
the

above

range
the
circuit

opens
and
the

light

goes
out
Ignition

switch
YW

B

1

Y

I
Fusible

link

YW

t

Thermal
transmitter
L

Fig
BE

25

OIL
PRESSURE

WARNING
LAMP

DESCRIPTION

The

engine
lubricating
system
in

corporates
an
oil

pressure

warning

lamp
which

glows
whenever

engine
oil

FUSE
BOX

SA

IGJ
G
YR

I

G

IGNITION

SWITCH

YB

I
FUSIBLE
LINK

O
J
BROWN
lffi

l

f

r@

Fuel

gauge

Fuel
tank

TO
METER
VOLTAGE
REGULATOR

TO
OTHER
WARNING

lAMPS

jt

Oil

PRESSURE

WARNING
LAhlP

YB

tl

PRESSURE

PRESSURE
FROM

BATTERY

BE263

Fig
BE

26
Circuit

of
oil

prelSure
warning
system

Fusible
link
Fuse
box

M
OIL
PRESSURE
SWITCH

To

replace
oil

pressure
switch

dis

connect

lead
wire
from
switch
termi

nal
and
unscrew
switch
from

engine

cylinder
block

Prior
to

installing
switch
to

cylinder

block
be

sure
to

apply
conductive

sealer
to
threads
of
new

switch

CHARGE
WARNING

LAMP

DESCRIPTION

The

charge
warning
lamp
glows

when
the

ignition
switch
is
set
to

ON
with
the

engine
shut
down

or

when
the

generator
falls
to

charge
with

the

engine
operated

When
the

ignition
switch
is

set
to

ON
the

charge
warning
circuit
is

closed
and
current
flows
from
the

ignition
switch
to
the

warning
lamp

and

grounds
through
the

regulator

Fig
BE
27

1
When
the

engine
is

started
and
the

generator
comes
into

operation
the

generator
output
cur

rent
N

opposes
th
current

flowing

from
the

warning
lamp
as
the
current

N
increases
the
solenoid
is
more

energized
and
the

pilot
lamp
relay

contacts
are

open
in
effect
it
oreaks

the

warning
circuit

ground
connection

and
the

lamp

goes
out
Fig
BE
27

2

Fusible
link
Fuse

box

M

From

battery

To

battery
Ig
ition

ru
nu
swllch

A
A
To

other

warning

h
To

ignition

IQlamps

i
J

r
coil
WR

t

I

j
Charge
warning
lamp

T

T

I
War

lamp
relay

J
I

Generator
v

it
ge
e

g
bt
From

battery

To

battery
Ignition

witch

J
i

L
r
t
ft
ignition

r

Glj
fCOil
WR

f

I
Warning
lamp
relay

Generator

Voltage
regulator
I
YR

Fig
BE
27
1

BE17
YR

UTO
other

warrung

lamps

Charge

warning
lamp

BE264

Fig
BE
27
2

Circuit

of
charge
warning
system

Condition

Inaccurate

speedometer

indication

Inaccurate
odometer

operation
Body
Electrical

System

Probable
cause

Inoperative
speedometer

Improperly
meshed
second
and
third

gear

worn

gears

Faulty
feeding
due
to
deformed
odometer

and

pinion
carrier

WATER
TEMPERATURE
AND
FUEL
GAUGES

Condition

Both
water

temperature

gauge
and

fuel

gauge

do
not

operate

Both
water

temperature

gauge
and
fuel

gauge

indicate

inaccurately

Water

temperature

gauge

Water

temperature

gauge
does

not

operate

Gauge
indicates

only

maximum

temperature

Water

temperature

gauge
does
not

operate
accurately
Probable
cause

Burnt

fuse

Inoperative
gauge
voltage
regulator

Inoperative
gauge
voltage
regulator
Gauge

pointer
fluctuates
excessively

Loose
of

poor
connection

Gauge
pointer

fluctuates
slightly

Correct
conn

Faulty
thermal
transmitter
or
loose
terminal

connection

When
thermal
transmitter

yellow
white

wire
is

grounded
gauge
pointer
fluctuates

Faulty
water

temperature
gauge

Open
circuit

Faulty
thermal
transmitter

Gauge
pointer
returns
to

original
position

when

ignition
switch
is
turned

off

Faulty
water

temperature
gauge

Gauge
pointer
indicates
maximum

tempera

ture
even
after

ignition
switch
is
turned

off

Faulty
water

temperature
gauge

Faulty
thermal
transmitter

Loose
or

poor
connection

BE
19
Corrective
action

Replace

Replace
speedometer

Replace
speedometer

Corrective
action

Correct

cause
and

replace
fuse

Replace
water

temperature

gauge

Replace
water

temperature
gauge

Correct
connector
contact

Replace
thermal
transmitter
or
correct

terminal
connection

Replace
wtater

temperature
gauge

Replace
thermal
transmitter

Replace
water

temperature
gauge

Connect
a
usn
resistance
between

ther

mal
transmitter

yellow
white
wire
and

ground
When

gauge
indicates

approximately

500C

i220F
gauge
is
serviceable

Correct

gauge
terminal
contact

Condition

Fuel

gauge

Fuel

gauge
does
not

operate

Pointer
indicates
only

F

position
Body
Electrical

System

Probable
cause

Faulty
tank
unit
or
loose
unit

terminal

connection

pointer
indicates
a
half
level
when
a
35U

resistance
is
connected
between
tank
unit

yellow
wire

and

ground

Faulty
fuel

gauge

Poor

or
loose
cormection

Open
circuit

Faulty
tank
unit

pointer
lowers
below
E

mark
when

igni

tion
switch
Is
turned

off

Faulty
fuel

gauge

pointer
still
indicates
F

position
when

ignition
switch
is
turned
off

OIL
P

RESSURE
AND
CHARGE
WARNING
LAMPS

Condition

Oil

pressure
wamiug

lamp

Lamp
does
not

light

when

ignition
switch
is

set
to
ON

Lamp
does
not

go
out

while

engine
is

being

operated

OIarge
warning
lamp

Lamp
does
not

light

when

ignition
switch
is

set

to
ON

Lamp
does
not

go
out

when

engine
is
started
Probable
cause

Inoperative
oil

pressure
switch
or
loose

switch
terminal
connection

When
switch

yellow
black
wire
is

grounded

warning
lamp
lights

Burnt
bulb
or
loose
bulb

Open
circuit

Lack
of

engine
oil

Oil

pressure
too
low

Inoperative
oil

pressure
switch

Burnt
bulb
or
loose
bulb

Warning
lamp
does
not

light
when

voltage

regulator
white
red
wire
is

grounded

Open
circuit

Faulty

charging
system

BE
20
Corrective
action

Replace
tank
unit
or
correct
terminal

con

nection

Replace
fuel

gauge

Conect
connector
terminal

contact

Replace
tank
unit

Replace
fuel

gauge

Corrective
action

Replace
switch
OJ
correct
terminal
connee

tion

Replace
bulb
or
correct
bulb
socket

Check
oil
level
and
add
oil
as

required

Inspect
engine
oil

pressure
system

Replace
oil

pressure
switch

Replace
bulb

or
correct
bulb
socket

Inspect
charging
system

Body
Electrical

System

TROUBLE
DIAGNOSES
AND
CORRECTIONS

HORN

Condition

Horn

does
not

operate

Horn

sounds

continuously

Reduced
volume

and
or
tone

quality
Probable
cause

Discharged
battery

Measure
specific
gravity
of

electrolyte

Burnt

fuse

Faulty
horn
button

contact

Horn
sounds
when

horn

relay
terminal
s

is

grounded

Inoperative
horn

relay

Horn

sounds
when
B
and

H
horn

relay

tenninals
are
connected
with
a
test
lead

Damaged
horn
or
loose
horn

terminal
con

nection

Short
circuited
horn

button
and
or
horn

button

lead
wire

When
light
green
lead
wire
is

disconnected

from
horn

relay
terminal
s

horn

stops
to

sound

Inoperative
horn

relay

Loose
or

poor
connector
contact

Fuse
relay
horn
and
or
horn

button

Damaged
horn

BE
33
Corrective
action

Recharge
or

replace
battery

Correct
cause
and

replace
fuse

Repair
horn
button

Replace
horn

relay

Correct
horn
te
inal
onnection
or

replace

horn

Repair
horn
button
or
its

wiring

Replace
horn

relay

Repair

Replace

m
W

D
to
l
l
0
c
l
l
s
Q
3
For
Automatic

Transmission
LB

B

For
Manual
Transmission

m
For
Automatic
Transmission

COLOR
CODE

B
Black

BI
Brown

G
Green

L
Blue

Lg
Light
green

R
Red

W
White

Y
Yellow

BW
Black
with
white
stripe

LgR
Light
green
with
red
stripe
BY
RB
RB

B
WB
RB

YB
2
RB
I
B

1

BW
r
BY

LB

For
Automatic

Transmission
to

o
c
m
r0

O
O
Dl

For
Manual

Transmission
@
CJ
lti
3

RB
fB

BY
YB
RB@RB
YB
BY

1
To
kickdown
solenoid

fOT
Automatic
Transmission

2
To
reverse
switch

for
Manual
Tranmission

3
To
inhibitor
switch

for
Automatic
Transmission

4
To
oil
pressure
switch

5
To
starter
motor

6
To
engine
room
harness

for
Manual
Transmission

7
To
engine
room
harness

for
Automatic
Transmission

m
J
c
@
@
r

1
I
I

I
II

U
j
J

r
U

I
IT

L
U
L
L

@

Qj
flll
I

1

I
I

1

lL

to
t
l

Q
1
To
room
Jamp
cable

2
To
light
switch

3
To
fuse

4
To
tachometer
or
clock

5
To
hazard
flasher
unit

6
To
stop
lamp
switch

7
To
ignition
switch

8
To
hazard
switch

9
To
tU
and
dimmer
switch

10
To
check
connector

11
To
AMP
M
T
only

11
To
combination
instrument

Non
California
mode15
except
for
Canada

13
To
combination
meter

14
To
flasher
unit

IS
To
kickdown
switch
AfT
only

16
To
hand
brake
switch

17
To
heater
motor

18
To
illumination
control
rheostat
19
To
wiper
switch
light
switch
illumination

lamp

20
To
wiper
switch

21
To
cigar
lighter

22
To
heater
control
illumination
lamp

23
To
radio

24
To
heater
control

25
To
belt
and
E
G
R
warning
lamp

Non
California
models
or
floor
te
peratuJe

California
models

26
To
heater
control
illumination
lamp

27
To
buzzer

28
To
belt
warning
timer
U
S
A
Olodels

29
To
indicator
lamp
AfT
only

30
To
cooler
harness

31
To
wiptr
motor

32
To
door
switch
R
H

33
To
engine
compartment
harness

34
To
floor
harness

E
m

S
@
o
J
o

Q
m
CD
n

Ql
en
I
i
3

Body
Electrical

System

TROUBLE
SHOOTING
GUIDE

Condition

Warning
lamp
does
not

light
in
START

posi

tion

of

ignition
switch
Probable
cause

Burnt
or

loose
bulb

Faulty
f1o
r

temperature
relay

Loose
connection

or

open
circuit

BE
44
Corrective
action

Replace
bulb

or
correct
bulb
socket

Conduct

continuity
test
and

repair
or
reo

place

Refer
to
Section

EC

Check

wiring
and
or

repair
if

necessary

1
I

6

I

BA

RY

i
Air

Conditioning

BW
c
J

BW

n
B

m

00
L
ELECTRIC

FUEL
PUMP

oB

tl

b@

L

t

FROM
LIGHT

SWITCH

c
J

LW
2
L

rRL
fZP
W

I
FUSE
15A

J
D
CJ
B

1
COMPRESSOR
RELAY
B

GL
I

lL

GL1J
ILLUMINATION

CONTROL

RHEOSTAT

3

ILLUMINATION

LAMP

I

I
MAIN
RELAY

FAN
SWITCH

I

r

1

UE
H

I

I
THERMO

SWITCH

COLOR

CODE

@

IC
PRESSU
1

rlTCH

D
D

G
c
J
oc

I
m

f
F
I
C
D

SOLENOID

COMPRESSOR

FUSE
LR

I

BW
O

W

ov
J

I

IG
0

0

OVJ

AC

6
B

BW

L

LW

LR

W

G

GL

RL
Black

Black
with
white

stripe

Blue

Blue
with

white

stripe

Blue
with
red

stripe

White

Green

Green
with

blue

stripe

Red
with
blue

stripe

IG

BW
t
1

n

L

IGNITION
SWITCH

AC727

Fig
A
C
B

Wiring
diagram
of
air
conditioner

system