Gearbox Reverse Switch
The Rear brake lights and reversing lights are on the same fuse.
If you find your reversing lights are not working or constantly on, your gearbox reversing switch has broken.
I aquired my replacement switch at the scrap yard for £3 pounds.
Its the same switch in all the rover PG1 gearboxes.
Lotus Part Number: A111F6021S
Rover Part Number: CDU51A
Also available from Eliseparts
It is a good idea to test the switch with an electric test meter, the switch completes the circuit
Fitting the reversing switch is very easy, the hardest part is removing the rear and engine undertray.