A replacement I should think. I'm not sure what that entails for your actual caravan but my first action would be to speak with the technical guys at Bailey or Sargent who are likely to be the original supplier the electrics. Both have an excellent reputation for freely helping customers resolve problems.
Dave.
------------- Never argue with an idiot, they will drag you down to their level and beat you on experience.
Mark Twain.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.