MG MGB User Manual

N
THE ELECTRICAL
SYSTEM
Z
Z/
‘
%
Fig.
N.11
Regulator
and
fuse
block
1.
Regulator.
4.
AUX. fuse
(35-amp.).
2.
AUX.
IGN. fuse
(35-
5.
Sparefuses.
amp).
6.
Line fuse—heated
back-light
3.
Fuse
block.
light (GT)’
The
fuse
between
terminals ‘1’
and ‘2’
protects
the
accessories which
operate
irrespective
of
whether
the
ignition
is
on or
off
and the fuse
between
terminals ‘3’
and
‘4’
protects
the
accessories
which
operate
only when
the
ignition
is switched
on.
Two
spare
fuses
are
provided,
and
it is
important that
only
fuses
of the
correct
value,
marked
inside
the fuse
tube,
should
be
used.
Blown
fuses
The
units
which
are
protected by
each fuse
can
readily
be
identified
by
referring
to
the
wiring diagram.
A blown
fuse
is indicated
by
the failure
of
all
the
units
protected by
it
and
is
con■rmed
by
examination of
the
fuse,
which
can
easily
be
withdrawn
from
the
spring
clips.
If
it
has
blown
the fused
state
of
the
wire
will
be
visible
inside the
glass
tube.
Before
renewing
a
blown
fuse
inspect
the
wiring of the
units that
have
failed
for
evidenee
of
a
short
circuit
or
other
faults
which
may
have
caused
the fuse
to
blow,
and
remedy
the
cause
of
the
trouble.
Section
N.8
WINDSHIELD
WIPER
Apart from
the
renewal
of
perished
wiper
blades,
the
windshield
wiper
requires
no
periodic
maintenance.
Inspect the
rubber
wiping
elements,
which after
long
service
become
worn
and should
be
renewed.
The
gearbox
and cable
rack
are
packed
with
grease
during
manufacture
and
need
no
further
lubrication.
Resetting
the limit
switch
If
the
wiper
fails
to
park
or
parks
unsatisfactorily,
the
limit switch
in
the gearbox
cover
should
be checked.
N.l4
Unless
the limit
switch
is correctly
set,
it
is possible for
the
wiper
motor
to
overrun
the
open-circuit
position and
continue
to
draw
current.
Slacken
the
four
screws
securing the
gearbox
cover
and
observe
the
projection
near
the
rim
of the
limit
switch.
Position
the
projection
in
line
with
the
groove
in
the
gearbox
cover.
Turn
the
limit
switch
25°
in
an
anti-clockwise
direction
and tighten
the four
securing
screws.
If
the
wiper blades
are
required
to
park
on
the
opposite
side
of
the
windshield,
the
limit
switch should
be
turned back
180°in
a
clockwise
direction.
Testing
on
a
vehicle
If
the
wiper
fails
to
operate,
or
operates
unsatisfactorily,
connect
a
0~15
moving-coil
ammeter
in
the
wiper
circuit,
switch
on
the
wiper,
and
note
the
current
being
supplied
to
the
motor.
The
normal
running
current
should
be
2.7
to
3.4
amps.
WIPER
TAKES
NO
CURRENT
Examine
the fuse
protecting
the
wiper
circuit.
If
the
fuse
has
blown
examine
the
wiring
of
the
motor
circuit and of
all
other
circuits
protected
by
that
fuse.
Renew,
if
necessary,
any
cables
which
are
badly
worn
or
chafed,
fitting
protective
sleeving
over
the
cables
to
prevent
a
recurrence
of
the fault.
If
the
external
wiring
is
found
to
be
in order,
replace
the
fuse
with
one
of
the
recommended
rating. Then
proceed
as
for
the
wiper taking
an
abnormally
high
current.
If
the
fuse
is
intact,
examine
the
wiring of the
motor
circuit
for
breaks
and
ensure
that
the
wiper
control
switch
is
operating
correctly.
Fig.
N.12
Lucas
type
7F]
fuse
block
(GHNS
and GHDS
cars)
1. Four-way
fuse
block.
2.
Current
rated
17-amp.
35-
amp.
blow
rated) fuses.
3.
Spare
fuses.
4.
Starter
solenoid.
MGB.
Issue4.
25729

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English