These switches are a direct replacement for the original Sinclair C5 light switch mounted to the left of the seat. It is a common issue that these switches wear out and become stiff with age. 

To remove the original switch simply squeeze the sprung retainers on each side of the switch and push forwards towards the handlebars to remove from the switch backet. Pull the spade connectors off the back of the old switch and connect to the new switch. Push the new switch into the switch bracket.

TOP TIP: If you believe your switch is at fault check the wiring spade connectors behind the switch. The spade connectors may be loose. If the bulbs are good then a replacement switch may be in order.