Hi, I did as Nick Baker did, but instead of spraying switch cleaner used isopropyl alcohol to clean all terminal contacts and remove excess grease. The plugs at the back of the switch can be a pain but there is a slot on one side of each plug where a small screwdriver can slip in and release them.
NB Care needs to be taken when removing the top of the switch mechanism as the locating lugs need to remain intact. Also be careful when putting the mechanism back together that the lighting switch mechanism is correctly located.
Thanks guys for your valuable help
Ray J
August 2009