Earth possible on the rear lights, pull the carpet behind the driver side out and clean the earth up, should sort that out, or try a fuse
If the dials aren't lit too then I doubt it's the earth really. More likely to have popped a fuse as it's the same one for illumination and the sidelight.
Do your front sidelights work?
It could be the stalk yeah as that's common between all three items.
I think I have one spare, but it doesn't have front fog option (basic model spec). Send me your address and I can drop it in the mail, will help eliminate whether yours is faulty or not?
Check the relays underneath the dash where the bonnet pull is, right below the glove box lid, exact same thing happened to mine and a mate had managed to kick one of them out.