Datsun 1000 - SERVICE PRECAUTIONS

5
Electrit
al
System
SERVICE
PRECAUTIONS
1
Make
SUTe the
battery
is connected the correct
way
Refer to
Specifications
Du
not short out or
ground any
terminals
common
to the
charging
circuit
t3 Always disconnect the
battery
before
connecting
a
battery
charger
4 If a
booster
battery
is
used
always
connect it in a
parallel
circuit Le
positive
to
positive t
to and ne
gative
to
negative
to to
maintain
a
12 volt
supply
pressure
S
Never
disconnect
the
battery
or
terminals
in
the
charging
circuit while the
engine
is
running
6
Regularly
check fan
belt
tension
dellection should
be 13
mm
O S in
7 Keep battery
terrninals clean and all
electrical
connections
tight
8
Disconnect
the
battery
and alternator
when
arc
welding
on
the vehicle
9 Never
connect a
capaeitor
to
the
field
F
terminal
TO
REMOVE AND
INSTAL
I
Fit covers to both fenders and
disconnect
the
battery
terminal
2 Disconnect the terminal
block
at
the alternator if
used
by
pulling
on
the
terminal
block
not the
wires or
remove
the
terminal nuts and
lock
washers to
remove the
wiring
from the
terminals
3 Loosen
both
mounting
bolt nuts
4
Remove the fan belt from
the
pulley
S
Remove
both
mounting
bolts
while
supporting
the
aiternator with the
hand do
not drop
or
bump
the
alternator
Installation is a
reverse of
the
removal
procedure
with
particul ir
attention
to
the
following
1
Do not
overtighten
the
mounting
bolts as
broken
mounting lugs
could
result
2
Do
not over tension the
fan
belt
3
Apply
pressure
to
the
mounting
end
bracket
only
when
adjusting
the
fan belt
4
Check
the
wiring
where soldered to
the
slide on
rmillals ill tlie t rmin tl
bluck
ur
where soldered to lhe
cye
terminals
TO TEST
THE
ALTERNATOR
I
Remove the
alternator from the vehicle
as
described under the
heading
TO REMOVE AND
INSTAL
t2
Mount
the
aiternator on an electrical test bench
equipped
for
testing
charging
circuits
3
Using
a
fully
charged battery
connect a 0 50
amp
test
ammeter
in
series between the
positive battery
terminal and the alternator A terminal
witli
an on
off
switch
in series at the
battery terminal
4
Bridge
the
F terminal
and
A
terminal at
the
alternator
S Connect a test voltmeter 0 20
vults between the A
terminal of
the alternator and the
negativ
terminal
of
the
battery
6
Earth the
alternator
frame
to the
negative
battery
terminal
7
Connect
a variable
load resistance
of
3S
amps
IS
ohms
with a switch in series
across
the
battery
8
Open
circuit the
variable
resistapce
with the
switch
9
When
testing
Hitachi LT12S
02 and
Mitsubishi
AS202SA 1 alternators
close the
On
Off switch at the
positive battery
terminals
leaving
the variable
resistance
switch
open slowly
increase the
speed
of the
alternator
until the
reverse
current
flow
is
eliminated and
a
2
amp
charge
is indicaied
on the
amtJleter
The
speed
of the
alternator should be
approximately
1000
rpm
at this
point
When
testing
the
Hitachi
LTl2S 06 and
LTl33
0S
alternators
slowly
increase
the alternator
speed
to
approximately
800
rpm
and
close the On
Off
switch at the
positive battery
terminal
gradually
increase the
aitematar
speed
until the voltmeter
reading
reaches 14
volts at this
point
the alternator
speed
Should be
less
than
looq
rpm
if
the
unit is
serviceabl
Ii
0 Close the switch of the
variable
resistance and
slowly
increase the
alternator
speed
to
approximately
2500
rpm
adjus
the variable resistance Until
the voltmeter reads
14 volts
The alternator
output
should be at
maximum
reading
refer
SpeCifications
no
noticeable
increase
in
alternator
output shoul9
occur as
the
rpm
is increased
a ove
this
figure
nor
should
there be
any drop
off
in
out ut
NOTE
Do not leave the variable resistance in circuit
longer
than
is llecessarv
to do the teSt
It
Should
the
alternator not meet the above tes
s
it
will
have to be
dismantled and all
components
tested
12 If
the
altcrll lfor test
prove
that the
alternator
is
serviceable but the
hattery
is
not
receiving
all
electrical
charge carry
out the
regulator
unit test
procedure
TO TEST ON
tHE VEHICLE
The
regulator
unit must not be in
circuit
when
drrying
qut
this test disconnect
the
battery
before
connecting any
of the
test
equipment
and
make
sure that
the
battery
is
fully charged
I
Disconnect the
wiring
from the
Nand
F
terminals
of tlie al
ernatoL
2
Connect
a 0 20
volt test
voltmeter between the A
terminal
of
the alternator and a
good
earth
check that
the
voltmeter reads battery
voltage
when
the
battery
is
reconnected
3
Connect a
jumper
lead
between the F
and
A
terminals
of
the
alternator
4
Connect a
tachometer
to
the
engine according
to
the
manufacturers
instructions
S
Reconnect
the
battery
termihais
and
start
the
engine
and
allow
to idle at its
minimum
speed
152
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