1970 model year, UK

Earth wiring

Colour Fuse Components
black none earth
black/green HRW in-line HRW in-line fuse
HRW switch
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 none solenoid
ignition switch
starter relay
main lighting switch
alternator (2)
brown/light-green green wiper manual switch
wiper motor park switch
brown/yellow none alternator
ignition warning light
green green fusebox
brake light switch
indicator flasher
heater fan switch
wiper motor
wiper switch
voltage stabiliser
tachometer (12v)
indicator flasher
reverse light switch
green/black 1 green fuel gauge
fuel tank sender
green/black 2 HRW in-line HRW switch
HRW warning light
green/brown green reverse lights switch
reverse lights
green/purple green brake light switch
brake lights
green/red green indicator-signal switch
left-side flashers
left-side flasher repeater
green/white green indicator-signal switch
right-side flashers
right-side flasher repeater
green/yellow green heater fan switch
heater fan
light-green/brown green indicator flasher
indicator switch
light-green/green green voltage stabiliser
fuel gauge
purple purple fusebox
headlamp flasher switch
courtesy light
purple/black purple horn switch
purple/white purple door switches
courtesy light
red red fusebox
rear/parking lights (one fuse per side)
red/green none main lighting switch
panel lights dimmer
map light switch
red/light-green green wiper switch
wiper motor 'normal' speed
red/purple none map light switch
map light
red/white none panel lights dimmer
panel lights
white 1 none ignition switch
ignition warning light
tachometer (signal 1)
fuel pump
overdrive manual switch
heated rear window fuse
white 2 none tachometer (signal 2)
coil +ve
white/black none coil -ve
white/brown none starter relay
starter solenoid
white/red none ignition switch
starter relay (via park/neutral switch automatics only)
yellow none overdrive manual switch
overdrive gearbox switch (part-way)
yellow/purple none overdrive gearbox switch
overdrive solenoid
yellow/red none overdrive manual switch
overdrive gearbox switch (part-way)

Earth wiring:

All earths wired to a body bolt or via bullet connectors are circled in red, plus the engine earth not shown. There is also a sealed junction circled in blue, this rarely gives problems. The remainder are picked up from the physical mounting of the component. Note the dual gauge is shown with a local earth instead of a wired earth as for the other instruments, this is probably an error: