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COMMONLY USED COLOUR CODES FOR
BRITISH CAR WIRING
Colour
Main/Tracer
Use
BROWN
Main battery feed
Brown/Blue Control box to ignition 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 ‘F’ to control box ‘F’
Brown/White Ammeter to control box
Brown/Yellow Alternator to ‘no charge’ warning light
Brown/Black Alternator battery sensing lead
Brown/Slate Starter relay contact to starter solenoid
Brown/Orange Fuel shut-off (diesel stop)
GREEN
Accessories fused via ignition switch
Green/Brown Switch to reverse lamp
Green/Blue Water termperature 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/Light 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 two or three-speed motor)
Green/Black Fuel gauge to fuel tank unit or changeover switch or voltage stabilizer to tank units
Green/Pink Fuse to flasher unit
Green/Slate a) Heater motor to switch (‘fast’ on two or three-speed motor)
Green/Orange Low fuel level switch to warning light
ORANGE
Wiper circuits fused via ignition switch
Orange/Blue Switch to front screen wiper motor first speed, timer or intermittent unit
Orange/Green Switch to front screen wiper motor second speed
Orange/Black Switch to front screen wiper motor parking circuit, timer or intermittent unit
Orange/Purple Timer to intermittent unit to motor parking circuit
Orange/White Timer to intermittent unit to motor parking circuit
Orange/Yellow Switch to headlamp or rear window wiper motor feed, timer or relay coil
Orange/Light 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/Slate Timer or relay to headlamp or rear window wiper motor parking circuit
PURPLE
Accessories fed direct from battery via fuse
Purple/Brown Horn fuse to horn relay when horn is fused separately
Auto Electric Supplies Ltd
www.autoelectricsupplies.co.uk
2
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
Purple/Green Fuse to hazard flasher
Purple/Light Green Fuse to relay for screen demist
Purple/White Interior lights to switch (subsidiary ciruit: door safety lights to switch)
Purple/Yellow Horn to horn relay
Purple/Pink Rear heated window to switch or relay
Purple/Slate Aerial lift motor to switch up
Purple/Orange Aerial lift motor to switch down
SLATE
Window lift main feed
WHITE
Ignition switch or starter solenoid to ballast resistor
White/Brown Oil pressure switch to warning light or guage; or starter relay to oil pressure switch
White/Blue Choke switch to choke solenoid (unfused) and/or choke to switch to warning light; or
White/Red Starter switch to starter solenoid or inhibitor switch or starter relay; or ignition (start position)
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/Light Green Start switch to starter interlock; or oil pressure switch to fuel pump; or start inhibitor switch to
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
White/Pink Ignition switch to radio fuse
White/Slate Current tachometer to ignition coil
White/Orange Hazard warning feed to switch
RED
Main feed to all circuits mastered by side lamp switch
Red/Brown Rear fog guard switch 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 side lamp
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
c) Fuse to panel light switch or rheostat
Red/Yellow Fog lamp switch to fog lamp or front fuse to fog lamps
Red/Black Left-hand, side lamp fuse to side and tail lamps and number plate illumination
Red/Pink Sidelamp fuse to lighting relay
Red/Slate Lamp failure unit to left-hand side and tail lamps
Red/Orange Fusebox to rear fog guard switch
LIGHT GREEN
Instrument voltage stabilizer to instruments
Light Green/Brown Flasher switch to flasher unit
Auto Electric Supplies Ltd
www.autoelectricsupplies.co.uk
3
Light Green/Blue a) Flasher switch to left-hand flasher warning light
b) Coolant level sensor to control unit
Light Green/Red Fuel tank changeover switch to right-hand tank unit; or entry and exit door closed switch to
Light Green/Purple Flasher unit to flasher warning light
Light Green/Green Start inhibitor relay to change speed switch; or switch to heater blower motor second speed
Light Green/White Low air pressure switch to buzzer and warning light
Light Green/Yellow Flasher switch to right-hand warning light; or differential lock switch, to differential lock
Light Green/Black Screen wash switch to screen wash motor
Light Green/Pink Hazard flasher unit to hazard switch
Light Green/Slate Fuel tank changeover switch to left-hand tank unit; or entry and exit door open switch to door
Light Green/Orange Rear window wash switch to wash pump; or cab lock-down switch to warning light
YELLOW
a) Overdrive
b) Petrol injection
c) Door locks
BLACK
All earth 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/Light Green 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 switch; or radio to speakers
Black/Yellow Electric speedometer
Black/Orange Radiator fan motor to thermal switch
BLUE
Lighting switch to dip switch
Blue/Brown Headlamp relay to headlamp fuse
Blue/Red Dip switch to headlamp dip beam fuse
Blue/Light Green 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
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/Slate Headlamp main beam fuse to left-hand headlamp or inboard
Blue/Orange Fuse to right-hand dip headlamp
PINK
/White Ballast terminal to ignition distributor
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