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ELECTRICAL
Polarity
The electrical installation on this car is NEGATIVE (-) earth return and
the
correct polarity must be maintained at all times. Reversed polarity will
per-
manently damage semi-conductor devices in the tachometer, and the ra
di
transistors (when fitted).
BATTERY BOOSTING AND CHARGING
CAUTION: The following precautions must be observed to avoid the possibility of
serious damage to the charging system or electrical components of the vehicle.
Battery A
high speed cha
rger
may only be used if the battery has been completely
charging
disconnected from the vehicle electrical system. Certain types of maintenance-free
batteries, for
example
the lead-calcium type, can be damaged by high speed
chargers. If in doubt, consult
your authorized
Austin MG Dealer.
rninal
voltage
of
the
battery ;
d
t
the positive (
+)
term inal
of the
th
nn
When charging
the battery in
the
v hid fr m an outsi
de source such as a trickle
charger,
ensu
re that:
- the
charger
voltage
i th
- the charger
positive (
+
)
1 d i
battery;
- the charger nega
tive (
-
)
lead
i
conn ected
to the
negative ( -
)
terminal of the
battery.
Battery boost A
high speed battery charger must not be used as a starting aid.
starting and
charging
When connecting an additional battery to boost a discharged bat
tery in the
Fig.
2
vehicle, ensure that:
- the booster battery is of the same nominal voltage as the vehicle
battery
;
- the interconnecting cables are of sufficient capacity to carry
starting
curr
nt :
- the cables are interconnected one at a time and to the booster battery
first ;
- the cables are connected between
the
battery terminals in the following
order:
first,
+
(positive)
to
+
(positive) and then - (negative) to - (negati
ve) ;
- the engine speed
is
reduced to 1,000 revfmin or below before
disconnecting
the boost
battery .
The vehicle
battery
must never be disconnected while the
engine is
running.
The electrolyte levels
(1)
in each cell are visible through the translucent
battery
case or may be checked by fully raising the vent cover
(2)
and tilting it to one
side.
The electrolyte level in each cell must be maintained so that the separator
plate
(3)
are just covered. To avoid flooding, the battery must not be topped up
within
half an hour of it having been charged from any source other than the
generating
system fitted to the car.
NOTE: Do not leave the battery in a discharged state for any length of
time.
When not in regular use have the battery fully charged, and every fortnight
give
a short refresher charge to prevent permanent damage to the battery plates
.
More frequent topping-up of the electrolyte levels may be necessary in
hot
weather or when long journeys are made.
To top up the levels raise the vent cover and pour distilled water into the
trough
(4) until all the rectangular filling slots (5) are full and the bottom of the
trough
is just covered. Press the cover firmly into position; the correct quantity of disti
lled
water will automatically be distributed to each cell. In extremely cold
conditions,
run the engine immediately after topping-up to mix the electrolyte.
DO NOT USE A NAKED LIGHT WHEN CHECKING THE LEVELS and
do
not use tap water for topping-up.
Before fitting a radio or any other electrical equipment, make certain
that
it
has the correct polarity for installation in this vehicle.
Battery
The battery must be kept clean and dry, and the terminals should be
smeared
Fig. 1
with petroleum jelly. The vehicle must be level when the electrolyte in the
cell
is being checked.
IMPORTANT: The vent cover must be kept closed at all times, except
when
topping-up. The electrolyte will flood if the cover is raised while either
trickle-
or fast-charging the battery. Fast charging should only be undertaken in extr
eme
circumstances, and must not exceed 40 amps for a maximum period of one
hour.
A single-cell' heavy discharge tester cannot be used on this type of
battery.
On
no occasion should the vent cover be detached from the battery.
UVlrU.KlA1"'l.l:
i
ne
vent
cover
mUST
oe
xept ciosec at
all urnes,
except
wnen
topping-up. The electrolyte will flood if the cover is raised while either
trickle-
or fast-charging the battery. Fast charging should only be undertaken in extr
eme
circumstances, and must not exceed 40 amps for a maximum period of one
hour.
A single-cell'
heavy
discharge tester cannot be used on this type of
battery.
On
no occasion should the vent cover be detached from the battery.
Fig. 1
~\~l
Fig. 2
~-
.. - ----..
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