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Firstly your caravan battery has nothing at all to do with runiing the fridge, nor does the switch that says car/caravan/off have anything to do with the fridge. The FRidge on 12v takes all its power from the cars charging circuits and is isolated from all of the caravans other circuits.  You need to check the S socket ( the grey one ) on the car and check that when the engine is running that you have a 12v supply across pins and 3 ( this way because it is a 1995 van ) ( the two on the right hand side as you look at it from where the plug goes in. This supply should give at least12v and probably more like 13.8v when the engine is running and no voltage at all when the engine is turned off.  I

If you have this then you need to plug the s plug in and then follow the cables back into the caravan until they connect to the fridge ( and see what voltage you have there, but my first check would be withing the S plug itself to make sure that the wires are all connected properly and that they are secure.

If searching through all this does not solve the problem you need an electrician.