Just interested how most people go about doing this. Do you ....

1. Cut & shut method - Join the cut ends of the old switch loom into new loom using butt splice connectors, solder joints or similar

2. Complete rewire method - Remove all old wiring and rewire plugs completely with new loom.

I soldered to the existing wires, then used heat-shrink tube over the top. Remember to make the joints at different distances from the switch, otherwise you'll have a heap of sleeving in one place, which makes a big lump in your covering!

David

Solder and heat shrink sleeving

As above

Heat shrink splices will allow you to see all the cable colours all the way through and are very effective.