1973 DATSUN B110 wiring

BODY
ELECTRICAL

WIRING

CONTENTS

WIRING
HARNESS

Engine
compartment
harness

I
nstrument
harness
BE
1

BE
1

BE
2

WIRING

HARNESS

The

wiring
harness
is
classified
into

engine
compart

ment
harness
instrument
harness
and

body
harness
The

individual
harness

Jocating
positions
and

connecting

Position
e
w
the

individual

wiring
harnesses
are

indicated
a
f
Moreover
for
the

body
harness
the

installing
positioJ
differ

mutually
in

Sedan

Coupe

Station

wagon

and
yan

Engine

compartment
harness

Fig
BE
1

Engine
compartment
harness
1
Body
harness

WI
RING
DIAGRAM

INSPECTION
BE
2

BE
4

BE
6

A
0

Ij

7
9

Fig
BE
2

Engine
compartment
harness
2

Fig
BE

3

Engine
compartment
harness
3

BE
1

Instrument

harness

Harnessterminal
in

the

engine
compartment
Switch
and
control

connecting
unit

Fig
BE4
Instrument
harness

I

I
Instrument
harness

2

Engine
room
harness

I
3

Body
harness

Fi
BE

5

Wiring
harness
connections

Body
harness

Fi
R
B1
6
Hocly
hamcss

1
BODY

Fig
BE
7

Body
harness
2

r

lj

I
I

I

I
Body
harness

2

Combination

lamp
RH

131
Body
earth

Fig
BE
8

Body
harness
Sednn

l

j
J

2

it

I

lJt

l

I

I
Body
harness

2
Combination

lamp
LH
7

13

I
To
Ikense

bmp

Fig
BE
9

Body
harness

Sedan

8E
2

SOD
I

HlRlNG
OlAGRAM

j

1
i

Il
fI
J

i
i

g

Cl
r

t

0

tf

j

i
r

U

i

q

l

1

v
t

f3
J

J
o

o

0

J

Fig
BE
14
Wiring
diagra
for
an
at
transmission
odel

BE
4

INSPECTION

Referring
to
the

wiring
diagram
check
the

wiring

harness

for
connection
with
electrical

equipment
and

connector
for
conned
ion
and
installation
When

checking

the

wiring
harness

note
the

following
matters

Connected
unit
should

not
be

loose
rusted
or

contaminated

2

Cable
insulator
cover
should
not
be

damaged
crack

ed
or

insulating
material

should
not
be
deteriorated

3
For
those

parts
which

are

grounded
through
the

installation

bolts
the
bolts
should
be
in
contact
with
the

body
completely
so
that

continuity
is

provided
in

between
the

body
and
bolts

4
Terminals

of
unit

through
which

current
flows

should
not
come

into
contact
with

other
metal

parts

5
No

erroneous
connection
should
be

present

DESCRIPTION

When
an
overcunent

exceeding
the
rated

amperage

flows
to
a
circuit
the

fuse
is
heated
and
melted
the

circuit
is

interrupted
and

thus
cables
and

electrical

equipment
are

protected
from

damaging
due
to

burning
or

damaging
is

limited
to
the

minimum
This
vehicle

is

equipped
with
six

fuses
and

one
fusible
link
The
fuses

are

located

in
the

fuse
box
and
used

to

protect
illumination

signal
and
other

systems
and
the
fusible
link
is

adopted

in
the
cable
between
the

battery
and
alternator
to

protect

the

charging
and

starting
circuits

FiJ
BE
16
Fuse
box
BODY

6
Cables
should
be

damped
so
that

they
do
not
come

into
contact
with

sharp
corner
or

part
lernperature
of

which

rises

highly

7
Cables
should
be

securely
clamped
in

posItions

sufficiently
separated
from

rotating
parts
such
as
fan

pulley
fan
belt

etc

8
Cables
should
be

provided
with
an

optimum
extra

length
at
sections

stationarity
on
the

body
or
at
sections

where
vibration

occurs
due
to

engine
operation
and

others

Note
a
When

inspecting
or

performing
other
mainte

nance

service
and
no

power
supply
is

required

particularly
or
when
it
is

anticipated
that
a

part

may
be
short
circuited
disconnect
the

battery
H

terminal

b
In
no
event
should
an
unloaded
circuit
be

directly
connected
with
ground
Be
sure
to
use
a

test

lamp
or
circuit

tester

fUSE

Fig
BE
17
Fusible
link

INSPECTION

In
the

most

cases
fuse
can
be

checked

visually

However
when

it
is
difficult
to

check

visually
a
circuit

tester

may
be
used

The
fusible
link
can

be

inspected

visually
or

by

feeling
on

finger

tip
However
the
fusible

link
can
be

inspected
more

correctly

by
using
a
circuit

tester

BE

6

BODY
ELECTRICAL

Note
8
When
a
fuse
is
blown
off
be
sure
to
correct
the

cause
before

installing
new

fuse

b
Be
sure
to
use
fuse

having
the
rated
capacity

Do
not
use
fuse

having
larger
capacity
i
e
20A

JOA
etc

c

Particularly
when
the
fusible
link
is
fused

replace
with
a

designated
fusible
link

Green
color

link
for
model
8110

In

comparison
with
fuse
much

higher
current
flows

through
the
fusible
link

Moreover
it
is

important
to
eliminate
the
cause

of

blown
off
fusible
link
before

replacing

d
When
fuse
is
connected
incorrectly
and
the

contact
is
loose
voltage
drops
and
heat
are

gener

ated
resulting
abnormally
operated
electrical

equip

ment
Remove
dust
or
when
oxidized

polish
with

a
fine

emery
paper
so
that
the
contact
is

improved

LlGHTING
SYSTEM

CONTENTS

HEAD
LAMP

Descri

ption

Sealed
beam

replacement

Aiming
adjustment

FRONT
PARKING
AND
TURN
SIGNAL

SIDE

FLASHER
IMARKER
LAMP

AN

D
LICENSE
LAMP

REAR
COMBINATION
LAMPS

BULB
SPECIFICATIONS

TURN
SIGNAL
AND
DIMMER

COMBINATION
SWITCH
BE
7

BE
7

BE
7

BE
8

LAMP

BE
8

BE
9

BE10

BE10

HEAD
LAMP

Description

All
weather

type
sealed
beam
2

light
system
front

lamps
are

adopted
Each

lamp
of
both
side
head

lamps
is

provided
with

high
beam
filament

for

long
range
SOW

and
low
beam
filarnent

for

dipping

40W
In

other
words

the

lamp
is
of
a
double
filament

type

Sealed
beam

replacement

I
Rernove

the

wiring
socket
from
back
of
the
head

lamp

2
Remove

the
screws

attaching
the
front

grille
to
the

radiator
core

support
Coupe
only

Remove
three

retaining
screws
and
remove
the
head

lamp
rim

All
other
than

coupe

3
Loosen
three

screws
used
to
install
the

retaining
ring

on
the
sealed
bearn

mounting
ring
and
remove
the

sealed
Removal

LIGHTING
SWITCH

Removal

HAZARD
WARNING
SWITCH

PASSING
LIGHT

SWITCH

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Head

lamp

Turn

signal
lamps

Tail
and

stop
lamp
license

lamp

back

up
lamp
BE
10

BE
11

BE
11

BE
11

BE
12

BE
12

BE
12

BE
13

BE
15

i

Ii
beam
unit

4
When

installing
a
new
unit

be
sure
to

position
the

Top
mark
to
the

top
of

ring

1

2
Sealed
beam
unit

Sealed
beam

mounting

ring
3

Retaining
ring

4

Aiming
adjusting
screws

Fig
BE
18

Replacing
sealed
beam

BE
7

BODY
ELECTRICAL

heater

unit
on
the
dash

board
and

remove
the

heater
unit

carefully
panel

8
Rernove
two

self

tapping
screws
from
back
of
the

instrument

panel
and
remove
the

defroster
nozzle

7

When

removing
the
heater

control
from
the
instru

ment

panel
remove
the
control

knob
and
loosen
two

screws
used
to
install

the
heater
control
on
the
instrument
9
The
heater
unit
is
installed
in
reverse

sequence
of

removal

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition
Probable
cause

Hot
air
does
not

come
out

Motor
does

not

operate
Open
or
short
circuit
of
feed

har

ness

Defective
switch

Defective
motor

Fan
cannot
be

rotated

smoothly
by
hand
Motor

journal
is
out
of
lubricant

or

stick

Hot
air

dose
not
come

out
nevertheless
fan
is

rotating
Slow
rotation

of
fan

Loose
fan

installation

Air

temperature
is
low

Hot

water
does

not
cir

culate
Defective
water

pump

Bent
or

clogged
of

connecting
hose

Defective
hot

water
cock

Air
is

left
in
the
hose

Water

temperature
is
too

low
Defective
thermostat

Water

leakage
from

heater
Defective
water
hose

Loose

clipping
of

water
hose

Improper
soldering
of
heater
core

Defective
defroster
Disconnected
defroster
hose

Bent
or
broken
defroster
hose

BE
35
Corrective
action

Check

and

repair
wiring
harness

Conduct

continuity
test
and

if

required
replace
switch

Replace
motor

Lubricate

journal

Replace
motor

Replace
motor

Repair

Repair
water

pump

Repair
or
clean

piping

Repair

Purge
air

out
of
hose

Replace
thermostat

Replace
water
hose

Retighten
clip

Solder

leaking
position

Correct
connection

Correct
or

replace

EMISSION
CONTROL
AND
TUNE
UP

EMISSION
CONTROL
SYSTEM

AN
D

ENGINE
TUNE
UP

CONTENTS

BASIC
MECHANICAL
SYSTEM
ET

Checking
and

adjusting
dash

pot

Adjusting
intake
and
exhaust
valve
automatic
transmission
model

only
ET
9

clearances
ET
1

Checking
carburetor
return

spring
ET
9

Checking
and

adjustin9
drive
belt
ET
2

Checking
choke
mechanism
choke
valve

Retightening
cylinder
head
bolts
manifold
and

linkagel
ET
9

nuts
and
carburetor

securing
nuts
ET
2

Checking
anti

dieseling
solenoid
ET
9

Checking
engine
oil
ET
2

Replacing
fuel
filter
ET
10

Replacing
oil
filter
ET
3

Checking
fuel
lines
hoses

pipings

Changing
engine
coolant
L
L
C
ET
3
connections
etc
ET10

Checking
cooling
system
hoses
and
THROTTLE
OPENER

CONTROL
SYSTEM

ET
10

connections

ET
4
Checking
and

adjusting
throttle

opener
ET
13

Checking
vacuum

fittings
hoses
and
TRANSMISSION
CONTROLLED
VACUUM

connections

ET
4
ADVANCE
SYSTEM

ET
17

Checking
engine
compression
ET
4
Checking
electrical
advance
control

system
ET
19

Checking
exhaust
manifold
heat
control
AUTOMATIC
TEMPERATURE
CONTROL
AIR

valve

ET
5
CLEANER
A
T
C
AIR
CLEANER

ET
20

IGNITION
AND
FUEL
SYSTEM

ET
5
Replacing
carburetor
air
cleaner
filter

ET
20

Checking
battery
ET
5
Checking
hot
air
control
valve

ET
20

Checking
and

adjusting
ignition
timing

ET
5
CRANKCASE
EMISSION
CONTROL

Checking
or

replacing
distributor
breaker
SYSTEM

ET
22

point
condenser
and

spark
plugs
ET
6
Checking
or

replacing
PCV
valve

ET
23

Checking
distributor

ignition
wiring
and

Checking
ventilation
hoses

ET
23

ignition
coil

ET
7
EVAPORATIVE
EMISSION
CONTROL

Checking
distributor

cap
and
rotor

ET
7
SYSTEM
ET
23

Adjusting
carburetor
id
Ie

rpm
and

Checking
engine
compartment
hose

mixture
ratio

ET

8
connections
and
fuel

vapor
control
valves
ET
23

Checking
fuel
tank

vacuum
relief
valve

operation
ET
24

BASIC
MECHANICAL
SYSTEM
1
Start

engine
and
run
it

until
it
is
heated
to

operating

temperature
or
at
least
more
than
800C

I760F
of

engine
oil

temperature
then

stop
engine
Adjusting
intake
and
exhaust

valve
clearances

Valve
clearance

adjustment
should
be
made
while

engine
is

stationary

To

adjust
proceed
as
follows
2
Rotate
crankshaft
to

bring
No
1

cylinder
in

top
dead

center
on
its

compression
stroke

3

Remove
valve
rocker
cover

to

gain
access
to
valve

ET
1

EMISSION
CONTROL
AND

TUNE
UP

Fig
ET
11

Checking
spark
plug
gap

Checking
distributor

ignition
wiring

and

ignition
coil

Distributor

Check

centrifugal
advance
unit
for
loose
connection

or

improper
operation

If
it
is
not

operating

properly
the
trouble

may
be
due

to
a

sticky
spring
or

excessively
worn

parts

This

operation
needs
a
distributor
tester
As
to

inspection
procedure
and
reference
data
refer

to

relative

topic
under
Distributor
in
Section
EE

Page

EE
32

If
vacuum
advance
mechanism
fails
to

operate

proJr

erly
check
for
the

following
items
and
correct
the

trouble
as

required

1

Check
vacuum
inlet
for

signs
of

leakage
at
its

connection
If

necessary
retighten
or

replace
with
a

new
one

2

Check
vacuum

diaphragm
for
air
leak

If
leak
is

found
replace

diaphragm
with
a

new
one

3

Inspect
breaker

plate
for
smooth

moving

If

plate
does
not
move
smoothly
this
condition
could

be
due
to

sticky
steel
balls
or

pivot

Apply
grease
to
steel
balls
or

if

necessary
replace

breaker

plate
as
an

assembly

For
vacuum
advance
characteristics
refer
to
Distribu

tor
in

Section
EE

Page
EE
32

Ignition
wiring

Use
an
ohmmeter
to
check
resistance
of
secondary

cables
Disconnect
cables
from

spark
plugs
and
install

the

proper
adapter
between
cable
and

spark
plug
Remove

distributor
cap
from
the
distributor

with

secondary
cables
attached
Do
not
remove
the
cables

from
the

cap

Check
the
resistance
of
one

cable
at
a
time

Connect
the
ohmmeter
between

the

spark
plug
adapter

and

the

corresponding
electrode

inside
the

cap
If

resistance
is

more
than
30

000
ohms
remove
the
cable

from
the

cap
and
check
cable
resistance

only
If
the

resistance
is
still

more
than
30
000
ohms
replace
cable

assembly

T

I

II

Fig
ET
12

Checking
high
tension
cables

Ignition
coil

Check

ignition
coil

for

appearance
oil

leakage
or

performance
For
details
refer
to
Section
EE

Page

EE36

Checking
distributor

cap
and
rotor

Note
This

operation
is
to
be

performed
while

chekcing

distribuotr

points
Inspect
distributor

cap
for

cracks
and
flash
over

External
surfaces
of
all

parts
of

secondary
system
must

be
cleaned
to
reduce

possibility
of

voltage
loss
All
wires

should
be
removed
from
distributor
cap
and
coil

so
that

terminals
can
be

inspected
and
cleaned
Burned
or

corroded
terminals
indicate
that
wires
were
not

fully

seated
which

causes
arcing
between
end
of
wire

and

terminal
When

replacing
wires
in

terminal
be
sure

they

are

fully
seated
before

pushing
rubber

nipple
down
over

tower

Check
distributor
rotor
for

damage
and
distributor

cap
for
cracks

ET
7