See also:
Fitting relays
Hints & tips
If problems arise with the light switch, such as the terminals at the back getting hot or poor connections causing the lights to flicker, it may be caused by dirt or corrosion on the terminals or stalk inside the switch. Don't squirt WD40 into the switch in the hope it will clean it - it won't. Before you dismantle the switch, disconnect the battery then remove the switch from the steering column by undoing the clamp. Now you will have to remove all the wires from the terminal board - the photo below shows where the wires go but make sure yours is the same as the photo before you remove them.
The two halves of the plastic switch body can be separated by removing the 3 Phillips screws on the underside. Separate the two halves carefully and make sure that the spring-loaded balls (shown in photo below) do not drop out - these hold the switch stalk in either the upper or lower position.
Carefully lift out the terminal board with the stalk still in place then remove the stalk from the terminals. Avoid touching the terminals and the circuit on the stalk as grease from your fingers could cause corrosion of brass and copper. (NB The terminal board consists of two pieces of insulating material and sandwiched between them are connections for live feed and the horn. Don't try to separate the two pieces).

Use Brasso or similar to clean the 6 terminals attached to the terminal board. In very bad cases of corrosion a VERY fine abrasive could be used as a last resort. The stalk has a simple kind of brass printed circuit, the pattern of which connects various terminals together as the stalk is turned or moved from upper to lower positions. This can again be cleaned with Brasso or similar so that it makes a good contact with the terminals.

Reassembly is a reversal of dismantling. To prevent the stalk being fitted 180deg wrong the holes in its mounting plate are of different sizes and locate on similarly sized plastic pegs in the two halves of the case (see photo). It is VERY important to make sure the terminal board is located in the slots provided in the case as if it isn't the terminals will not be in contact with the printed circuit on the stalk and some or all of the lights will fail to operate. If problems still persist, such as the terminals getting too hot to touch, read our section on relays; the 'hints & tips' section also has a section on lighting faults (links at the top of this page).
A pin and two tabs at the end of the stalk prevent it from being turned 360deg (see photo). Ensure these are effective or you may get an unwanted or strange combination of lights when you turn the switch (such as main beam but no rear lights).
Technical pages
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