LH type without ignition relay
LH type with ignition relay - UK
LH type with ignition relay - North America
Hover over a wire to confirm the colour
LH type without ignition relay:
LH type with ignition relay - UK:
LH type with ignition relay - North America:
Note: For a few months from late 76 to Feb 77 the original gearbox Overdrive switch operating in 3rd and 4th was used plus an additional TCSA (Transmission Controlled Spark Advance) microswitch operating in 2nd and 4th. Wiring these two switches in series allowed the TCSA i.e. vacuum advance to be enabled in 4th gear only whilst Overdrive was still available in both 3rd and 4th. In Feb 77, possibly due to unreliability or cost considerations, the microswitch was deleted and the Overdrive switch arrangements changed to operate in 4th gear only, feeding both the TCSA and Overdrive. With this arrangement the output of the gearbox switch fed both the Overdrive manual switch and the TCSA solenoid directly.
The location of the gearbox Overdrive and reverse light switches (UK rubber bumper 74.5 to 76):
