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sounds like a wireing fault on the car or the caravan........see

http://www.a-tconsulting.co.uk/caravan_tech/12n_wiring_details.html

I believe under the single plug system, one of the pins was for the carvan interior supply.

When rear fogs became standard that pin was used instead. The caravan interior feed, fridge, charge and reversing lights all went onto the 12S (grey) plug.

Its easy enough to check using the pin diagram and a mulimeter or a test lamp.

The grey which is the 12S plug should activate the reversing lights (if fitted) and not rear fog lights. The rear fog lights should be connected to the black which is the12N plug so there is a possibilty that the grey plug is incorrectly wired up. The links below show the pin connections and what they are linked to.

12N wiring diagram (black)

http://www.westerntowing.co.uk/acatalog/Trailer_12N_wiring_diagram.html

12S wiring diagram (grey)

http://www.westerntowing.co.uk/acatalog/Caravan_12S_wiring_diagram.html