British Standards Colour Codes
The British Standards institution (BSI) creates and maintains standards for British industries, one of which is colour coding automotive wire insulation based upon the use of the wire. This is a great help to those of us maintaining our own British cars allowing us to glance at a wire and know what it is being used for. This standard is periodically updated as vehicles become more complex with more colour combinations used and in some cases the uses are changed for a colour combination. Colour code tables for BS-AU7a (1983 revision) and newer can be found with an internet search.
Black
Black/ Purple Black/ Green
Black/white Blue
Blue All ground connections
Black/ Light green Black/Orange Black/red
Blue White Blue/ White Blue/ White Blue/ Red
Temperature switch to warning light Relay to radiator fan motor Brake light switch
Headlamp feed
ALTERNATOR 51 53
53a 53b 53c 53e 53i
Radiator fan motor to thermal (fan)switch From 3 terminal flasher unit to flasher light Flasher unit light to ground
Headlamp switch to dip switch Headlight high beams
Blue/ Yellow Brown
Driving lamp switch to lamp
Brown/ Blue Brown/ White Brown/ Yellow Brown/ Green
Green
High beam dip switch to high beam indicator lamp Dip switch to Driving light switch Headlight low beams
Brown/ Lt. Green Brown/ Black
wiper motors, to brake Green/ Black
Green/ Blue Green/ Brown Green/ Red
Green/ Purple Green/ White Green/ Yellow Green/ Yellow Green/ Gray
Light green
Light green/ Black Light green/ Blue Light green/ Brown Light green/ Purple Light green/ Orange
Orange
Orange/ Black Orange/ Blue Orange/ Green Orange/ Yellow
Purple/ Brown Purple/ Red
Red/ Yellow Red/ Blue
White/ Black White/ Black White/ Brown White/ Pink White/ Red
White White White
Red/ Brown Red Orange Red/ White
Main feed from the battery. No switches or fuses Power feed to headlamp switch Ammeter to main alternator terminal Alternator to 'no charge' warning light Fuse to horn (No relay)
Windscreen wiper motor to switch Horn to horn button (no relay)
Ignition switch controlled wiring for auxiliary devices, switched 12V to individual light switch, flashers, etc
Fuel gauge to fuel tank unit
Water temperature gauge to temperature sender unit Switch to reverse lamp
Direction indicator switch to left-hand flasher lamps Stop lamp switch to stop lamps
82 Direction indicator switch to right hand flasher lamps
Heater switch to slow speed on heater motor or for single speed motor Oil pressure light to oil pressure switch Heater switch to high speed on heater motor
Voltage stabilizer to instruments on LRs fitted with voltage stabilizer Windscreen washer switch to motor
Flasher switch to left-hand flasher warning light Flasher switch to flasher unit
Flasher unit to flasher warning light Rear window washer switch to motor
Orange/ Light green Purple
direct from battery Red
Wiper circuit (single motor wiper system) Wiper switch to to motor parking wiper switch to low speed on motor Wiper switch to high speed on motor Rear wiper switch to rear wiper motor Switch to rear window motor parking
Accessories fed direct from battery via fuse (Always live) Horn fuse to horn relay when horn is fused separately
Switches to map light, under bonnet light, glove box light and boot lamp when fed Tail lights, instrument lights, parking lights and side markers
Fog light switch to fog light or front fog light fuse to fog lights Front fog light fuse to fog light switch Rear fog guard switch to lamps Power to rear fog guard lamp fuse
Fuse to instrument lamp switch, Instrument panel lamps Ignition circuit, no additional switches, not fused
Distributor side of coil to tach impulse sensor Oil pressure switch to warning light or gauge Ignition switch to radio fuse
Power to coil, fuse to cold running light Power to electric fuel pump Ignition coil to distributor
Ignition switch or starter switch to starter solenoid
Aproximate equivalent wire sizes and current capacities:
General use - 8 Amps. 14 strand (UK), 18 gauge(US)
Tail & side lamps. general instrument wiring- 17 amps. 28 strand(UK), 14 gauge (US)
Headlamps, horns, Aux lighting - 25.5 Amps. 44 strand (UK), 12 guage (US)
Generator to Control box & Ammeter - 35 Amps. 65 strand (UK), 10 guage (US)
Alternator feed & ammeter - 30 Amp FLASHER UNIT
LAMPS DASH
INDICATOR EARTH
TERMINAL DESIGNATIONS BY COUNTRY GERMANY FRANCE JAPAN US & GB +49 49a C
+ 12V +
C R
2nd DASH INDICATOR
31 C2
R2
B L
E
X / B L P
Ground C2
To order Tel: 01580 891309 or 01580 448007 or online at
www.carbuildersolutions.com ISSUE 31 Page 145
DIN STANDARD TERMINAL DESIGNATIONS 1
IGNITION COIL TO IGNITION DISTRIBU- TOR
Low tension 4 15 15a
17 19
30 31
32 33
45 49
49a 49b
50
IGNITION COIL TO IGNITION DISTRIBU- TOR
High tension
Ignition controlled feed (ignition switch) Ballast resistor to ignition coil
GLOW PLUG TO STARTER SWITCH Start
Preheat
Direct feed from battery positive terminal Earth or battery negative
ELECTRIC MOTORS Return
Main terminal
Starter relay feed to starter motor input (main feed)
INDICATOR FLASHER UNIT +12 v Input
Output to indicator switch Output second turn signal circuit
Starter feed direct
C Turn signal dash indicator lamp C2 Second dash indicator lamp X + 12 Volt input L
Load (eg bulbs) P Dash warning lamp
B+ B- D+ D-
EX, EXC IND
88
88a 88b 88c 88z 88y 88x
82a 82b 82z 82y
83
83a 83b 83L 83R
84
84a 84b
85 86
86a 86b
87
87a 87b 87c 87z 87y 87x
55 56
56a 56b 56d 57
58
61 67 75 76
81
81a 81b
DC voltage at rectifier
WIPER MOTOR Feed Wiper (+) self parking switch Wiper (shunt winding) Windscreen washer pump Wiper (brake winding)
Permanent magnet wiper motor third brush (2 speed)
Fog lamps Headlamps
Main beam and main beam indicator Dip beam
Headlamp flash contact Side marker lamp
Sidelights, tail lights, number plate lamps and instrument panel lamps
Alternator charge warning light Alternator field
Radio, Cigarette lighter, Power outlet Loudspeakers
NORMALLY CLOSED AND CHANGEOVER SWITCHES Feed
First output Second output
NORMALLY OPEN SWITCHES Feed
First output Second output First input Second input
MULTI POSITION SWITCHES Feed
Output position 1 Output position 2 Output left-hand Output right-hand
CURRENT RELAYS
Feed, winding and relay contact Finish of winding Output relay contact
SWITCHING RELAYS Finish of winding (earth) Start of winding
Start of winding of first winding Winding tap or second winding
NORMALLY CLOSED AND CHANGE-OVER CONTACTS Input
First output (break side) Second output Third output First input Second input Third input
NORMALLY OPEN AND CHANGE OVER CONTACTS Input
First output Second output Third output First input Second Input Third Input
GENERATOR AND GENERATOR REGULA- TOR
Battery positive generator output Battery negative Generator positive Generator negative Generator field
Warning light
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