MG MGB - THE ELECTRICAL SYSTEM; DIAGRAM 14 (Refer to page Nb.2 for the key); KEY TO THE WIRING DIAGRAMS

Nb
THE
ELECTRICAL
SYSTEM
No. Description
No.
1. Alternator.
34,
3. Batteries
(6-volt)/battery
(l2-volt).
3
5.
4.
Starter solenoid.
37.
5. Starter
motor.
38_
6. Lighting switch.
39.
7.
Headlampdip switch.
40.
8. Headlamp
dip beam.
41.
9.
Headlampmain
beam.
43.
10. Headlamp
main beam warning
lamp
44.
11. R.H. parking lamp.
45_
12.
L.H. parking lamp.
46_
13. Panellamp rheostat
switch.
47_
14.
Panelillumination
lamp.
49.
15. Number-plate
illumination lamps.
50'
16. Stop
lamp.
53.
17. R.H. tail lamp.
54'
18.
Stop lamp switch.
55.
19. Fuseunit
(4-way).
57.
20.
Interior
courtesy
lamp.
58.
21.
Interior lamp door switch.
60
22.
L.H.
tail
lamp.
64-
23.
Horn.
65.
24.
Horn-push.
66'
25.
Flasher
unit.
67.
26. Direction indicator
switch.
71.
27.
Direction indicator
warning lamp.
72'
28.
R.H. front direction
indicator lamp.
73.
29.
L.H.
front
direction
indicator lamp.
76_
30.
R.H.
rear
direction
indicator lamp.
31.
L.H.
rear
direction indicator
lamp.
77-
32.
Heater
motor
switch.
82-
33.
Heater
motor. 95.
N.
Brown.
U. Blue.
R. Red.
Nh.l6
KEY
TO THE
WIRING
DIAGRAMS
—
Nos. 14
onwards
(Refer
to
page
Nb.2
for
the
key
to
diagrams
Nos.
1
$113)
Use this
one
key to
identify
components
on
the wiring diagrams from
No. 14
onwards.
Refer
to
the
appropriate wiring diagram, and disregard
any
additional
numbered
items
appearing
in
the
key
and
not
on
a
particular
diagram.
Description
Fuel
gauge.
Fuel
gauge
tank unit.
Windscreen
wiper
motor.
I
gnition/
starter
switch.
Ignition
coiL
Distributor.
Fuel
pump.
Oil
pressure
gauge.
Ignition
warning
lamp.
Headlamp
■asher
switch.
Coolant
temperature
gauge.
Coolant
temperature transmitter.
Reverse
lamp
switch.
Reverse
lamp.
Fog lamp
switch.4*
Fog lamp.*
Driving
lamp.*
Cigar lighter—illuminated.
*
Driving
lamp
switch.*
Radio.*
Instrument
voltage
stabilizer.
Luggage
compartment
lamp
switch.
Luggage
compartment
lamp.
Line
fuse.
Overdrive
solenoid.*
Overdrive
manual
control switch.*
Overdrive
gear
switch.*
Automatic
gearbox
gear
selector
illumination
lamp
(early
cars).
Windscreen
washer
pump.
Switch
illumination
lamp.
Tachometer.
No.
115.
116.
118.
150.
152.
153.
154.
159.
160.
168.
169.
170.
171.
172.
173.
174.
196.
197.
198.
199.
200.
201.
202.
203.
208.
211.
240.
244.
245.
* Optional
■tment
circuits shown dotted.
CABLE
COLOUR
CODE
P. Purple.
W.
White
G
Green.
.Y. Yellow
LG.
Light Green.
B. Black.
K.
Pink.
0.
Orange.
S. Slate.
Description
Heated
back-light
switch*
T only
Heated back—light*
Combined
Windscreen
washer
and
wiper
switch.
Heated
back-light
warning lamp *
(GT
only).
Hazard
warning lamp.
Hazard
warning switch.
Hazard
warning flasher
unit.
Brake
pressure
warning
lamp and lamp
test-push.
Brake
pressure
failure
switch.
Audible
warning
buzzer.
Ignition
key
audible
warning
door
switch.
R.H. front
side-marker
lamp.
L.H. front
side-marker
lamp.
R.H.
rear
side-marker
lamp.
L.H.
rear
side-marker
lamp.
Starter
solenoid
relay.
Running-on
control valve.
Running-on
control valve
oil
pressure
switch.
Driver’s
seat
belt buckle
switch.
Passenger’s
seat
belt
buckle switch.
Passenger
seat
switch.
Seat
belt warning
gearbox switch.
‘Fasten belts’
warning
light.
Line diode.
Cigar lighter illumination.
Heater
control illumination lamp.
Heated back-light relay.
Driver’s
seat
switch.
Sequential
seat
belt
control
unit.
When
a
cable has
two
colour
code letters
the first denotes
the‘main
colour
and the
seconddenotes
the
tracer
colour.
MGB.
Issue
3.
89961