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N
THE
ELECTRICAL EQUIPMENT
GE.'IERAL
DESCRIPTIO:-;
The
12-,oll
ekctrical equipment
incorporates
com-
pcnS3ted
voltage control
for the charging
circuit.
The
positive earth
system
of wiring is
employed.
The two 6-volt balleries, mounted to the rear of the
seats, are accessible for examination and maintenance
attention.
The
dynamo
is
mounted
on
the right of
the
cylinder
block
and driven by endless belt
from the
engine crank-
shaft.
A
rotatable mounting
enables the belt tension
to
be
adjusted.
The
control box is sealed
and
should
not normally
need
:ut.,ntion.
The
fuses and spare fuses arc carried in
external
holders.
The
starter motor is
mounted on the flywheel housing
on the right-hand
side
of the engine unit and operates
on
the
ll~bec:l
through the usual slidiog pinion device.
The
headlamps
employ the double-filament
dipping
system.
Both
lamps d ip according to
the
regulations
existing
in
the country concerned.
Section
N.l
BATTERY MAINTENANCE
In order
to
keep
the
batteries
in good condition a
periodical inspection
must
be made.
Unscrew
the
live
quick-release
fasteners
sec;uring the
panel
immediately
behind the seats and
lift
the
panel
away
to
obtain
access to the
batteries.
Topping
up
Remove
the Iiller plug from each cell
and
eumine the
level of
the
electrolyte.
Add
distilled
water
as required
to bring the level of
the
electrolyte
just above the
separators.
NOTE.- Oo
not ose
tap-water aod do
not use a naked
light
whtn examining the
condition
of
the
eells.
Wipe
away
all
dirt
and
moistiU'c
from the top
of the
battery.
Testing
the
coodition
of
tbe battery
Every 1,000 miles
(1600 km.)
examine the condition of
the
batteries by taking hydrometer readings.
The hydro-
meter
contains
a graduated float on which is indicated
the
speeofic
gravity
of the acid
in
the
oeD
from which the
same
is
taken.
The
speCllic
gravit)
readings and their
indications
are
...
folio"
•·
Climo"s
Mlo"'
90'
F.
(32,
C)
1·270
to 1·290
Cell fully charged.
1·
190
to 1·210
Ctll about half-discharged.
1·110 to 1·130
Cell
fully
discharged.
N.4
Climates
freq~~tmtly
abo•·"
90° F.
(J2
·
C)
1·210
to
1·230
Cell full)
charged.
1·130 to
H 50
Cell
about half-discharged.
I
-()50
to
I
-()70
Cell fully discharged.
Thtse figures are
civen assuming
aD
tleetrolyte
tcm.
p «a-
ture of
60•
F.
(16°
C.). If
the
temper~ture
of
the
electrolyte
exceeds this, -()()2
must
be added
to
hydromtter reading>
for
each
s•
F.
rise
to
give
the true
specific
gravity.
Similarly
-()()2
must be
subtracted from
hydrometer
readings for every
s•
F.
below
60°
F.
The readings of all
the
cells
should
be approximately
the same.
If
one cell gh·es a reading Vf!ry different from
the
rest
it
may
be that
the electrolyte
has been spilled
or has
leaked
from the cell
or
there may be an internal
fauiL
Should
a battery be in a low
state
of charge,
it
should be recharged by
taking
the car for a long daytime
run or by
charging
from
an
external source of
D
.C.
supply at a
current rate
of S amps. until the cells are
gassing freely.
Aner examining
the battery check the vent plugs,
making
sure that
the
air
pasi&ges arc clear.
S
toraze
If
a battery is to be
out of
use
for any
length of time
it
should
first be fully charged
and
then
given a
freshening
charge
about every
fonnig)lt.
A
battery
must
never remain in a discharged condit ion,
as
the plates
will
become
sulphated.
Initial
lilliDg
aod
ebarJboc
W
hen
a new
battery
bas
been supplied dry it is
necessary
to
fill the cells with elecuolyte of the correct
specific
gravity.
Batteries having
type
suffix
letter
·vr
(e.g.
SGW,
etc.)
are assembled
with
wet wood separators which
have
a
diluting effect on
the
lilling-in
solution.
T
o compensate
for this
dilution an acid
having a hig)ler
specific gravity
than
that
of
a
fully
eharged battery is
required
.
Climate
Below 90•
F
.
(32° C.)
0¥er
90'
F.
(32°
'
C .)
S.G. of
S.G.
at
end
filling acid
of charge
(correct
to
6()•
F.
(16°
C.D
1·340
1·270to 1·290
1·290
1·210tol·230
AU other
batteries,
including
those
having
type suffix
letttr 'Z'
(e.g.
STGZ,
etc.) and those having no additional
suffix
letter (e.g.
SG,
BT,
etc.),
are
assembled
with dry
separators.
The
specific gravity of tht filling-in solution
for
these
batteries should
be
tht same as that required at
the end of the charge (i.e. 1·270 for
climates
below
90•
F.
[32'
C.) and
1·210
for climates
frequently
above 90° F.
(32"
C.
D.
For
more
details
of
the
requirements of 'dry-
charged'
batteries
see Section N .28.
MGA
(Twin
Cam).
Issue
2.
23026
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