Hi Charles,
For LoveJugs install on 2013:
Switch was from Maplin and is in the spare hole in the dash used for the accessories socket. I took the live feed from the back of the accessories socket through to switch then to the fans. The earth i took directly back to the negative terminal of the battery for the fans. For the illumination of the switch i used the earth on the back of the accessories socket. The advantage of using the accessories socket is that it is already fused.
Photos are now stored here https://www.flickr.com/photos/129292693@N03/sets/72157651111792768/
For bobin modifications:
https://flic.kr/s/aHsk9XN1NvSteve