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Volvo 121 - Electrical System

Volvo 121
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DESCRIPTION
Electrical system
The electrical system is of the 12-volt type and is fitted with a volt-
age control dynamo. The starter motor is controlled from the instrument
panel by means of the ignition key. This key also forms the main switch
for the rest of the electrical system. The cables to the headlights, parking
lights
and internal lighting, however, are not taken over the ignition
switch but can be switched on and off without the ignition key being in
position.
Lighting
The lighting on the vehicle consists of two headlights (full and dipped)
together
with two combined flasher and parking lights. At the rear the
lighting consists of two tail lights including flashers, combined lamps for
the tail lights and brake warning lights, and the back-up light. Internal
lighting consists of a roof light above the rear view mirror and a light
for the parcel shelf.
See pages 42-44 concerning replacement of bulbs.
Fuses
The electrical system is protected by means of fuses fitted in a fusebox to
the left on the bulkhead under the bonnet. When replacing a fuse, be sure
that you use a one of the right rating. If one of the fuses should blow
repeatedly, do not fit a more powerful fuse. Instead, take the vehicle to
a workshop for a check of the electrical system.
1
)
Applies only to cars equipped with overdrive
1
2
1.
Flasher and parking
22. Battery
screen wiper and
light, left
23. Fusebox
washer
2.
Headlight, left 24. Brake contact
43. Lighting switch
3.
Horn
25.
Door contact, left
44. Ignition switch
4.
Headlight, right
26. Light signal device
45.
Cigarette lighter
5.
Flasher and parking
27.
Relay for horn
46.
Control for
light, right
28.
Overdrive switch')
ventilation fan
6.
Connector
29.
Roof light
47.
Glove compartment
7.
Junction block
30. Switch for roof
lighting
8.
Relay for headlight
light
48. Switch for glove
signal
31. Flasher unit, direc-
compartment
9.
Reversing light
tion indicators
lighting
contact
32.
Door contact, right
49. Fuel gauge
10.
Distributor
33.
Control lamp for
i
mpulse unit
11.
Dynamo
charging
50.
Rear lamp, left, with
12.
Charging control
34.
Control lamp for
rear light, stop light,
13.
Relay for reversing
fullbeam headlights
flasher and back-up
light
35.
Control lamp for
light
14.
Relay for over-
direction indicators
51.
Number plate
drive')
36.
Control lamp for
lighting
15.
Overdrive contact')
oil pressure
52.
Rear lamp, right,
16. Ignition coil
37. Fuel gauge
with rear light,
17.
Oil pressure
38.
Windscreen wiper
stop light, flasher
warning indicator
39. Instrument lighting
and back-up light
18.
Foot dipper switch
40.
Ventilation fan
A = White E = Grey
19. Solenoid for
41.
Control lamp for
B=Black
F =Yellow
overdrive')
overdrive
C= Blue
G=Brown
20. Starter motor
42.
Control for wind-
D = Green H =Red
21.
Windscreen washer
I
= Spare lead

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