Electrical System - Volvo 121 Servicing

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. Flasher and parking
light, left
2. Headlight, left
3. Horn
4. Headlight, right
5. Flasher and parking 27. Relay for horn
light, right
6. Connector
7. Junction block
8. Relay for headlight
signal
9. Reversing light
contact
10. Distributor
11. Dynamo
12. Charging control
13. Relay for reversing
light
14. Relay for over-
drive')
15. Overdrive contact')
16. Ignition coil
17. Oil pressure
warning indicator
18. Foot dipper switch
19. Solenoid for
overdrive')
20. Starter motor
21. Windscreen washer
1 2
1
)
Applies only to cars equipped with overdrive
22. Battery
23. Fusebox
24. Brake contact
25. Door contact, left
26. Light signal device
28. Overdrive switch')
29. Roof light
30. Switch for roof
light
31. Flasher unit, direc-
tion indicators
32. Door contact, right
33. Control lamp for
charging
34. Control lamp for
fullbeam headlights
35. Control lamp for
direction indicators
36. Control lamp for
oil pressure
37. Fuel gauge
38. Windscreen wiper
39. Instrument lighting
40. Ventilation fan
41. Control lamp for
overdrive
42. Control for wind-
screen wiper and
washer
43. Lighting switch
44. Ignition switch
45. Cigarette lighter
46. Control for
ventilation fan
47. Glove compartment
lighting
48. Switch for glove
compartment
lighting
49. Fuel gauge
impulse unit
50. Rear lamp, left, with
rear light, stop light,
flasher and back-up
light
51. Number plate
lighting
52. Rear lamp, right,
with rear light,
stop light, flasher
and back-up light
A = White E = Grey
B=Black F =Yellow
C= Blue G=Brown
D = Green H =Red
I = Spare lead