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In the United Kingdom the British Standard BS-AU7 determines colour coding of automobile wiring. Lucas use a 7 colour set in which plain colours - purple, green, blue, red, white, brown and green are supplemented by a further group using a base colour with a thin line trace of a different colour, thus:

Black

earth (ground) connections

Green

feeds to auxiliary devices controlled by the ignition switch, eg wipers, flashers, etc

White

base colour for ignition circuits

Red

sidelights (parking lights) and rear lights

Blue

with white trace main beam headlamp with red trace - dip (meeting) beam headlamp

Purple

auxiliary devices not fed via the ignitior switch, eg horn, interior light

Brown

main battery feed

Other colours are used, according to equipment specifications, eg light green, pink, slate. Handbooks are usually printed in black and white only, so the cable colours are identified by a lettering code, such as:
 

B

Black

P

Purple

U

Blue

G

Green

N

Brown

S

Slate

R

Red 

W

White

When a cable has a base colour and a second colour spiral trace the code is code is, for example: WG = White with green trace
 

Main

Tracer

Destination

Black

 

All earth connections

Black

Blue

Tachometer generator to tachometer

Black

Brown

Tachometer generator to tachometer

Black

Green

Screenwiper switch to screenwiper (single speed) relay to radiator fan motor

Black

L. Green

Vacuum brake switch to warning light and/or buzzer

Black

Orange

Radiator fan motor to thermal switch

Black

Red

Electric speedometer

Black

White

Brake fluid level warning light to switch and handbrake switch

Black

Yellow

Electric speedometer

Blue

 

Lighting switch (head) to dipper switch

Blue

L. Green

Screenwiper motor to switch

Blue

Pink

Headlamp dip beam fuse to left hand headlamp (when independently fused)

Blue

Red

Dipper switch to headlamp dip beam. Headlamp dip beam fuse to right-hand headlamp (when independently fused)

Blue

Slate

Headlamp main beam fuse to left hand headlamp or inboard headlamps (when independently fused)

Blue

White

Dipper switch to main beam (subsidiary circuit – headlamp flasher relay to headlamp). Headlamp main beam fuse to right-hand headlamp (when independently fused). Headlamp main beam fuse to outboard headlamps (when outboard headlamps independently fused). Dipper switch to main beam warning light

Blue

Yellow

Long range driving switch to lamp.

Brown

 

Main battery feed

Brown

Black

Alternator warning light, negative side

Brown

Blue

Control box (compensated voltage control only) to ignition and ignition switch, eg wipers, flashers, etc lighting switch (feed)

Brown

Green

Dynamo ‘F’ to control box ‘F’ Alternator field ‘F’ to control box ‘F’

Brown

L. Green

Screenwiper motor to switch

Brown

Purple

Alternator regulator feed

Brown

Red

Compression ignition starting aid to switch. Main battery feed to double pole ignition switch (a.c. alt. system)

Brown

White

Ammeter to control box. Ammeter to main alternator terminal

Brown

Yellow

Dynamo ‘D’ to control box ‘D’and ignition warning light. Alternator neutral point

Green

 

Accessories fused via ignition switch (subsidiary circuit fuse A4 to hazard switch (terminal 6)) 

Green

Black

Fuel gauge to fuel tank unit or changeover switch

Green

Blue

Water temperature gauge to temperature unit

Green

Brown

Reverse lamp to switch

Green

L. green

Hazard flasher unit to hazard pilot lamp

Green

Orange

Low fuel level warning light

Green

Pink

Choke solenoid to choke switch (when fused)

Green

Purple

Stop lamps to stop lamp switch

Green

Red

Left-hand flasher lamps

Green

Slate

Heater motor to switch (or to fast)(on 2-speed motor)

Green

White

Right-hand flasher lamps

Green

Yellow

Heater motor to switch, single speed (or to ‘slow’ on two-speed motor)

L. Green

 

Instrument voltage stabilizer to instruments

L. Green

Black

Screen jet switch to screen jet motor

L. Green

Blue

Flasher switch to left-hand flasher warning light

L. Green

Brown

Flasher switch to flasher unit ‘L’

L. Green

Pink

Flasher unit ‘L’ to emergency switch (simultaneous flashing)

L. Green

Purple

Flasher unit ‘F’ to flasher warning light

L. Green

Red

Fuel tank changeover switch to right-hand tank unit

L. Green

Slate

Fuel tank changeover switch to left-hand tank unit

L. Green

Yellow

Flasher switch to right-hand flasher warning light

Purple

 

Accessories fused direct from battery

Purple

Black

Horn or horn relay to horn push

Purple

Brown

Horn fuse to horn relay (when horn is fused separately)

Purple

Orange

Aerial lift motor switch DOWN

Purple

Red

Boot light switch to boot light

Purple

Slate

Aerial lift motor to switch UP

Purple

White

Interior light to switch (subsidiary circuit—door safety lights to switch )

Purple

Yellow

Horn to horn relay

Red

 

Side and tail lamp feed

Red

Black

Parking switch to left-hand side lamp

Red

Brown

Variable intensity panel lights (when used in addition to normal panel lights)

Red

Green

Lighting switch to side and tail lamp fuse (when fused)

Red

L. Green

Screenwiper motor to switch

Red

Orange

Parking light switch to right-hand sidelamp

Red

Purple

Map light switch to map light

Red

White

Panel light switch to panel lights

Red

Yellow

Fog lamp switch to fog lamp

White

 

Ignition control circuit (unfused) (ignition switch to ballast resistor)

White

Black

Ignition coil CB to distributor contact breaker. Rear heated window to switch or fuse TAC ignition

White

Blue

Choke switch to choke solenoid (unfused). Rear heater fuse unit to switch. Electronic ignition TAC ignition unit to resistance.

White

Brown

Oil pressure switch to warning light or gauge

White

L. Green

Screenwiper motor to switch

White

Orange

Hazard warning feed (to switch)

White

Pink

Radio from ignition switch

White

Purple

Fuel pump

White

Red

Solenoid starter switch to starter push or inhibitor switch

White

Slate

Tachometer to ignition coil

White

Yellow

Starter inhibitor switch to starter push. Ballast resislor to coil. Starter solenoid to coil

Yellow

L. Green

Screenwiper motor to switch