Unlikely a fuse Shayne. It MAY be a bit clever and only show when there's a bulb in the fog light though. Not sure on that TBH.View attachment 109914 Could find nothing at my tow socket that might relate to fogs so went to have a look at Helen's truck and her fog doesn't work either , the bulb and fuse are good so I pulled the switch which all looks good .
Only thing I can think of is the bulb that lights up the switch also acts as a fuse , does this sound likely ?
Unlikely a fuse Shayne. It MAY be a bit clever and only show when there's a bulb in the fog light though. Not sure on that TBH.