Wiring Colour Code Table
This is an extract from BS-AU7a 1983 Colour Code for Vehicle Wiring, from the British Standards Institution.
(Note that these colour codes may not apply directly to older cars. )
For example, the wipers on cars up to 1980 (at least) are not on a separate fuse circuit, so they are not orange, but
green.
Check the schematic for your car to be certain.
MAIN TRACER PURPOSE
BLACK/BLACK/BLACK/BLACK/
Black /Solid: All earth (ground) connections
Black/Brown: Tachometer generator to tachometer
Black/Blue: Tachometer generator to tachometer
Black/Red: Electric or electronic speedometer to sensor
Black/Purple: Temperature switch to warning light
Black/Green: Relay to radiator fan motor
Black/LightGreen: Vacuum brake switch or brake differential pressure valve to warning light and/or buzzer
Black/White: Brake fluid level warning light to switch and handbrake swith, or radio to speakers
Black/Yellow: Electric speedometer
Black/Orange: Radiator fan motor to thermal switch
BLUE/BLUE/BLUE/BLUE/
Blue Solid: Lighting switch (head) to dip beam switch
Blue/Brown: Headlamp relay to headlamp fuse
Blue/Red: Dip switch to headlamp dip beam fuse - Fuse to right-hand dip headlamp
Blue/LightGreen: Headlamp wiper motor to headlamp wash pump motor
Blue/White;
a)Dip switch to headlamp main beam fuse
b)Headlamp flasher to main beam fuse
c)Dip switch main beam warning light
d)Dip switch to long-range driving light switch
Blue/Yellow: Long-range driving light switch to lamp
Blue/Black: Fuse to right-hand main headlamp
Blue/Pink: Fuse to left-hand dip headlamp
Blue/SlateGrey: Headlamp main beam fuse to left-hand headlamp or inboard headlamps when independently fused
Blue/Orange: Fuse to right-hand dip headlamp
BROWN/BROWN/BROWN/
Brown Solid: Main battery lead
Brown/Blue: Control box (compensated voltage control only) to ignition switch and lighting switch (feed)
Brown/Red: Compression ignition starting aid to switch , Main battery feed to double pole ignition switch
Brown/Purple: Alternator regulator feed
Brown/Green: Dynamo (Generator) *F* to control box regulator pole *F* or Alternator field *F* to regulator *F*
Brown/White: Ammeter to Regulator, Ammeter to main alternator terminal
Brown/Yellow: Alternator to 'no charge' warning light
Brown/Black: Alternator battery sensing lead
Brown/SlateGrey: Starter relay contact to starter solenoid
Brown/Orange: Fuel shut-off (diesel stop)
GREEN/GREEN/GREEN/GREEN/
Green Solid: Ignition switch accessories / fused
Green/Brown: Switch to reverse lamps
Green/Blue: Water temperature gauge to temperature unit
Green/Red: Direction indicator switch to left-hand flasher lamps
Green/Purple: Stop lamp switch to stop lamps, or stop lamp switch to lamp failure unit
Green/Lt.Green: Hazard flasher unit to hazard pilot lamp or lamp failure unit to stop lamp bulbs
Green/White: Direction indicator switch to right hand flasher lamps
Green/Yellow: Heater motor to switch single speed (or to 'slow' on tow- or three-speed motor)
Green/Black: Fuel gauge to fuel tank unit or switch, stabilizer to tank units
Green/Pink: Fuse to flasher unit
Green/SlateGrey;
a) Heater motor to switch ('fast' on two- or three-speed motor)
b)Coolant level unit to warning light
Green/Orange: Low fuel level switch to warning lamp
LT.GREEN/LT.GREEN/LT.GREEN
Lt.GreenSolid: Instrument voltage stabilizer to instruments
Lt.Green/Brown:Flasher switch to flasher unit
Lt.Green/Blue;
a)Flasher switch to left-hand flasher warning light
b)Coolant level sensor to control unit
c)Test switch to coolant level control unit
Lt.Green/Red: Fuel tank changeover switch to right-hand tank unit or entry and exit door closed switch to door actuator
Lt.Green/Purple: Flasher unit to flasher warning light
Lt.Green/Green: Start inhibitor relay to change speed switch; or switch to heater blower motor second speed on three-speed unit
Lt.Green/White: Low air pressure switch to buzzer and warning light
Lt.Green/Yellow: Flasher switch to right-hand warning light; or differential lock switch to differential lock warning light
Lt.Green/Black: Front screen jet switch to screen jet motor
Lt.Green/SlateGrey: Fuel tank changeover switch to left-hand tank unit; or entry and exit door open switch to door actuator
Lt.Green/Orange: Rear window wash switch to wash pump or cab lock-down switch to warning light
ORANGE/ORANGE/ORANGE/ORANGE/
OrangeSolid: Wiper circuits fused via ignition switch
Orange/Blue:Switch to front screen wiper motor first speed timer or intermittend unit
Orange/Green: Switch to front screen wiper motor second speed
Orange/Black: Switch to front screen wiper motor parking cicuit, timer or intermittent unit
Orange/Purple:Timer or intermittent unit to motor parking circuit
Orange/White:Timer or intermittent unit to motor parking circuit
Orange/Yellow:Switch to headlamp or rear window wiper motor feed, timer or relay coil
Orange/Lt.Green: Switch to headlamp or rear window wiper motor parking circuit timer or relay coil
Orange/Pink: Timer or relay to headlamp or rear window wiper motor feed
Orange/SlateGrey: Timer or relay to headlamp or rear window wiper motor parking circuit
Pink/white: Ballast terminal to ignition distributor
PURPLE/PURPLE/PURPLE/PURPLE/
PurpleSolid:Accessories fed direct from battery via fuse
Purple/Brown:Horn fuse to horn relay when horn is fused separately
Purple/Blue:Fuse to heated rear window relay or switch and warning light
Purple/Red:Switches to map light, under bonnet light, glove box light and boot lamp when fed direct from battery fuse
Purple/Green:Fuse to hazard flasher
Purple/Lt.Green:Fuse to relay for screen demist
Purple/White : Interior lights to switch (subsidiary circuit door safety lights to switch)
Purple/Yellow : Horn to horn relay
Purple/Black : Horn to horn relay to horn push
Purple/Pink : Rear heated window to switch or relay
Purple/SlateGrey:Antenna motor to switch *up*
Purple/Orange : Aerial lift motor to switch down
RED/RED/RED/RED/
RedSolid :Main feed to all circuits mastered by sidelamp switch
Red/Brown :Rear fog guard switch to lamps
Red/Blue :Front fog lamp fuse to fog lamp switch
Red/Purple :Switches to map light, under bonnet light, glove box light and boot lamp when sidelamp circuit fed
Red/Green :Bulb failure unit to right-hand-side and rear lamps
Red/White ;
a)Sidelamp fuse to right-hand side and rear lamps
b)Sidelamp fuse to panel light rheostat
c)Fuse to panel light switch or rheostat
d)Fuse to fibre optic lamp source
Red/Yellow:Fog lamp switch to fog lamp or front fog fuse to fog lamps
Red/Black:Left-hand,sidelamp fuse to side and tail lamps and number plate illumination
Red/Pink:Sidelamp fuse to lighting relay
Red/SlateGrey:Lamp failure unit to lef-hand side and tail lamps
Red/Orange :Fusebox to rear fog guard switch
Red/SlateGrey :Window lift main lead
WHITE/WHITE/WHITE/WHITE/
WhiteSolid:Ignition switch or starter solenoid to ballast resistor
White/Brown:
Oil pressure switch to warning light or gauge, or starter relay to
oil pressure switch
White/Blue:Choke switch to choke solenoid (unfused) and/or choke to switch to warning light, or electronic ignition distributor to drive resistor
White/Red:Starter switch to starter solenoid or inhibitor switch or starter relay or ignition (start position) to bulb failure unit
White/Purple:Fuel pump no 1 or right-hand to changeover switch
White/Green:Fuel pump no 2 or left-hand to changeover switch
White/Lt.Green:Start switch to starter interlock or
oil pressure switch to fuel pump or start inhibitor switch to starter relay or solenoid
White/Yellow:Ballast resistor to coil or starter solenoid to coil
White/Black:Ignition coil contact breaker to distributor contact breaker, or distributor side of coil to voltage impulse tachometer
White/Pink:Ignition switch to radio fuse
White/SlateGrey:Current tachometer to ignition coil
White/Orange:Hazard warning lead to switch
YELLOW/YELLOW/YELLOW/YELLOW/
Yellow :
a)0verdrive
b)fuel injection
c)Door locks
d)Gear selector switch to start