1978 model year on, UK

Earth wiring

Colour Fuse Components
black/green cooling fan in-line cooling fan switch
cooling fan
blue none main lighting switch
blue/light-green green wiper switch
wiper motor 'fast' speed
blue/red none dipswitch
headlamp dipped beams
blue/white none or
purple (flasher)
headlamp flasher switch
'main beam' warning light
headlamp main beams
brown 1 none solenoid
alternator (2)
ignition relay
main lighting switch
ignition switch
starter relay
hazards in-line fuse
brown 2 hazards in-line hazards in-line fuse
hazard flasher
brown/light-green green wiper manual switch
wiper motor park switch
brown/yellow none alternator
ignition warning light
green 1 green fusebox
handbrake switch
seat-belt warning light
voltage stabiliser
wiper motor
wiper switch
brake light switch
reverse light switch
screen washer motor
green 2 green 1 hazard switch
turn flasher
green 3 cooling fan in-line cooling fan in-line fuse
cooling fan switch
green 4 green 4 green 4 in-line fuse
hazards switch
heater fan switch
tachometer 12v
HRW switch
green/black green fuel gauge
fuel tank sender
green/blue green temp gauge sender
temp gauge
green/brown 1 green reverse lights switch
reverse lights
green/brown 2 green heater fan switch
heater fan fast speed
green/orange green handbrake diode
handbrake switch
handbrake warning light
green/purple green brake light switch
brake lights
green/red green or
hazards in-line
turn-signal switch
hazard switch
left-side flashers
left-side flasher repeater
green/white green or
hazards in-line
turn-signal switch
hazard switch
right-side flashers
right-side flasher repeater
green/yellow green heater fan switch
heater fan slow speed
light-green/black green screen washer switch
screen washer pump
light-green/brown 1 green turn flasher
turn switch
light-green/brown 2 hazards in-line hazards flasher
hazards switch
light-green/green green voltage stabiliser
fuel gauge
temp gauge
purple purple fusebox
horn switch
boot/loadspace light
headlamp flasher
courtesy light
cigar lighter
time delay unit
purple/black purple horn switch
purple/white 1 purple door switches
courtesy light manual switch
courtesy light
purple/white 2 purple boot/hatch switch
boot/loadspace light
red red fusebox
rear/parking lights (one fuse per side)
red/green none main lighting switch
panel lights dimmer
red/light-green green wiper switch
wiper motor 'normal' speed
red/white none panel lights dimmer
panel lights
white 1 none ignition switch
ignition relay
coil ballast resistor (part way)
white 2 none ignition relay (part way)
fuel pump
white 3 none ignition relay (part way)
ignition warning lamp
white/black 1 none coil -ve
tachometer (signal)
white/black 2 green HRW switch
HRW warning lamp
white/brown 1 none ignition relay
fuel pump (part way)
overdrive manual switch
cooling fan in-line fuse
ignition warning light (part way)
white/brown 2 none ignition switch (part way)
coil ballast resistor
green 4 in-line fuse
white/green none ignition switch
accessories connector
white/light-green none coil ballast resistor
coil +ve
starter solenoid
white/red 1 none ignition switch
starter relay winding
time delay unit
handbrake diode
white/red 2 none starter relay contact
starter solenoid
yellow none overdrive manual switch
overdrive gearbox switch
yellow/brown green drivers seat-belt buckle switch
time delay unit
yellow/purple 1 none overdrive gearbox switch
overdrive solenoid
yellow/purple 2 green time delay unit
seat-belt warning light

Earth wiring:

All earths wired to a body bolt or via bullet connectors are circled in red, plus the gearbox earth not shown. There are also three sealed junctions circled in blue, these rarely give problems. The remainder are picked up from the physical mounting of the component: