1973 model year, North America

Earth wiring

Colour Fuse Components
black none earth
black/white 1 purple brake pressure test switch
brake pressure failure switch
black/white 2 purple brake pressure failure switch
brake pressure failure lamp
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)
hazards in-line fuse
ignition relay
main lighting switch
ignition switch (2)
starter relay
brown 2 hazards in-line hazards in-line fuse
hazard flasher
brown/light-green green wiper manual switch
wiper motor park switch
brown/red green passenger seat switch
driver seat-belt buckle switch
seat-belt diode
seat-belt warning light
brown/yellow none alternator
ignition warning light
green 1 green fusebox
tachometer 12v
voltage stabiliser
brake light switch
reverse light switch
hazard flasher switch
gearbox seat-belt switch
HRW switch
green 2 green hazard switch
indicator flasher
green/black green fuel gauge
fuel tank sender
green/blue green temp transmitter
temp gauge
green/brown green reverse lights switch
reverse lights
green/pink accessories in-line fuse accessories in-line fuse
wiper switch
wiper motor
screen washer pump
heater fan switch
green/purple green brake light switch
brake lights
green/red green or
hazards in-line
indicator-signal switch
hazard switch
left-side flashers
left-side flasher repeater
green/white green or
hazards in-line
indicator-signal switch
hazard switch
right-side flashers
right-side flasher repeater
green/yellow green heater fan switch
heater fan
light-green/black green screen washer switch
screen washer pump
light-green/brown 1 green indicator flasher
indicator switch
light-green/brown 2 hazards in-line hazards flasher
hazards switch
light-green/green green voltage stabiliser
fuel gauge
temp gauge
light-green/orange green passenger seat-belt buckle switch
passenger seat switch
light-green/purple hazards in-line hazards switch
hazards warning light
light-green/white green gearbox seat-belt warning switch
seat-belt buckle switches
purple purple fusebox
courtesy light
cigar lighter
brake pressure fail lamp
headlamp flasher
boot/loadspace light
ignition key warning door switch
purple/black purple horn switch
purple/green purple ignition key buzzer
ignition key buzzer door switch
seat-belt diode
purple/pink purple ignition switch
ignition key buzzer
purple/white 1 purple door switches
courtesy light
purple/white 2 purple boot/hatch switch
boot/loadspace light
red red fusebox
rear/parking/side marker lights (one fuse per side)
red/brown HRW in-line HRW switch
HRW warning lamp
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
slate none ignition switch
anti-runon valve in-line fuse
slate/purple anti-runon valve in-line fuse anti-runon valve in-line fuse
anti-runon valve
slate/yellow anti-runon valve in-line fuse anti-runon valve
oil pressure switch
white none ignition switch
ignition warning light
coil +ve
fuel pump
overdrive manual switch
white/black 1 none coil -ve
tachometer (signal)
white/black 2 green HRW switch
white/brown none starter relay
starter solenoid
white/green none ignition switch
accessories in-line fuse
white/red none ignition switch
starter relay (via park/neutral switch automatics only)
yellow none overdrive manual switch
overdrive gearbox switch
yellow/purple none overdrive gearbox switch
overdrive solenoid

Earth wiring:

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