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N
THE ELECTRICAL EQUIPMENT
Section N.26
LOCATIO
N
AND
REMEDY
OF
FAULTS
Although
every
precaution is taken
to
elimin
ate
possible causes
of trouble,
failure may occasionally
dev~lop
through lack of
attention
to the
equipment,
or
damage to
the wiring.
The
following pages set out the
recommended procedure for a systematic
examination
to locate
and
remedy the
causes
of some of
the
more
usual
faults
encountered.
The
sources of
trouble are
by
no means always
obvious, and in
some
cases a considerable amount of
deduction from the symptoms
is
needed
before the
cause
is
disclosed.
For
instance, the engine might not respond to
the
starter
switch;
a
hasty
inference
would be
that
the
starter
motor
is a
t
fault.
However,
as
the motor is
dependent on the batteries it may
be
that the batteries
are exhausted.
This,
in turn, may be due
to
the dynamo failing
to
charge the
batteries,
and the
final
cause
of
the trouble
may be, perhaps, a
loose
connection in some part
of
the
charging circuiL
If, after
carrying
out an examination, the
cause of the
trouble
is
not found, the equipment should be
checked
by
tbe
nearest
Lucas
Se,
r vice Depot
or
Ageot.
CHARGING
CIRCUIT
1. Batteries
In lo"
state
of ebarge
(a) This state will
be shown by
Jack
of
power
when
starting, poor
light
from the
lamps,
and hydro-
meter
.v.dings below
I
·200. It
may be due
to
the
dynamo not charging or giving
low
or
inter-
mittent outpuL
The
ignition warning
light will
not
go
out if the dynamo
fails
to charge, or
will
flicker on and
ofT in
the
event of intermittent
output.
(b)
Examine the
charging
and
field circuit
wiring,
tightening
any
loose coonectiollS or
renewing
broken cables. Pay
particular
attention to the
battery connections.
(c) Examine the dynamo
driving belt; take
up
any
und.1e slackness
by
swinging
the
dynamo
out-
wards
on its mounting
after slackening
the
attach-
ment bolts.
(d) Check the
regulator setting, and
adjust
if
necessary.
(")
If, after carrying
out
the above, the
trouble
is still
not
cured,
have the equipment examined
by
a
Lucas S.:rvice Depot
or Agent.
2.
Batteries
ovndaarge4
This
will
be
indicated
by
burnt-out
bulbs,
very
frequent
need for
toppi ng up the batteries,
and high
hydrometer
N.l8
readings.
Check
the charge reading with
an
ammctu
when the car
is running.
It
should be of
the
order
of
only
3
to
4
amps.
If
the ammeter reading is in
excess of
this
value it is
advisable
to check
the
regulator
setting, and adjust if
necessary.
STARTER
MOTOR
1.
Starter
motor lads power
01'
faDs
to
tum
eaglne
(a)
See if the engine can
be turned
over by
hand. If
not,
the cause of
the
stiffness
in
the engine
m
ust
be
located
and remedied.
(b)
If
the engine
can
be turned
by
hand, first check
that the
trouble
is not
due
to
a discharged
battery.
(c)
Examine
the connections
to
the batteries, starter,
and
starter switch, making sure that they are
tight
and
tbat the cables
connecting
these
units
are
not
damaged.
(d)
It
is
also
possible
that
the
starter
pinion may have
jammed
in
mesh
with
the
flywheel, although
this
is by
no means a common
occurrence.
To dis-
engage
the pinion rotate the squared cod of
the
starter
shaft by
means
of
a
spanner.
2.
Starter
operates but does oot crank the
m~Poe
This
fault
will
occur if the
pinion
of the
starter
drive
is
no! l!llowed to
move along the
screwC(!
sleeve
i!llo
engagement
with the flywheel, due to
dirt
having
collected
on the screwed sleeve. Remove the starter
and
clean
the
sleeve carefully with paraffin
(kerosene).
3. Starter
ploioo will
oot
diseagqe from ftywbeel
wbea
engine
is
ruoolng
Stop the
engine
and see if the
starter
pinion
is
jammed
in mesh with
the
flywheel, releasing it
if necessary by
rotation
of
the
squared end of
the
starter
shaft.
If
the
pinion
persists in sticking in mesh have
the
equipment
examined at
a Service
Depot. Serious
d amage
may
result
to the
starter if it
is
driven by
the ftywbecl.
LIGHTING
CIRCUITS
1.
Lamps
ci•e
IIIIS!dlldmt IUaminadoo
(a)
Test
the state
of
charge
of
the battery,
recharging
it
if
necessary from
an independent electrical
supply.
{b)
Check the
setting
of the lamps.
(c)
If
the
bulbs a re
discoloured
as the result
of
long
service
they should be
renewed.
2. Lamps ligllt W'hell swltc:bed
on
but gradually fade out
As paragraph I
(a).
3. Brilllaoce
Yaria
wf"
speed
of
car
(a)
As paragraph
I
(a).
(b)
Examine
'the
battery
connections,
making
sure
that
they
are tight,
and
renew any
faulty cables.
MGA
(Twin
Ca.
m ).
Issue
3.
27765
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