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/ Light green Black/Orange Black/red
Black/white Blue
Blue
Blue White Blue/ White Blue/ White Blue/ Red
Blue/ Yellow Brown
Brown/ Blue Brown/ White Brown/ Yellow Brown/ Green
Brown/ Lt. Green Brown/ Black
Green
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
Orange/ Light green Purple
Purple/ Brown Purple/ Red
Red
Red/ Yellow Red/ Blue
Red/ Brown Red Orange Red/ White
White White White
White/ Black White/ Black White/ Brown White/ Pink White/ Red
All ground connections
Temperature switch to warning light Relay to radiator fan motor Brake light switch
Radiator fan motor to thermal (fan)switch From 3 terminal flasher unit to flasher light Flasher unit light to ground
Headlamp feed
Headlamp switch to dip switch Headlight high beams
High beam dip switch to high beam indicator lamp Dip switch to Driving light switch Headlight low beams
Driving lamp switch to lamp
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 wiper motors, to brake 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
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
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 direct from battery 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
Power to coil, fuse to cold running light Power to electric fuel pump Ignition coil to distributor
Distributor side of coil to tach impulse sensor Oil pressure switch to warning light or gauge Ignition switch to radio fuse
Ignition switch or starter switch to starter solenoid
Aproximately 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
To order Tel: 01580 891309 or 07964 336183 or Fax: 01580 893733 or online at
www.cbsonline.co.uk
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