Hi Eric, if you mean the standard Bambi fridge (Electrolux/Dometic RM122/123) they would not normally be wired so they can run off the leisure battery. The reason for this is that they would flatten the battery quite quickly as the fridge takes 7-8 amps - that's about the same as a pair of headlights and we all know what happens when headlights get left on

By the sound of things, gas is your friend for now...