if it is a ammonia one they only work if they are level. make sure it is level and leave it standing for a few days. sometimes they work sometimes they don't. they definitely wont work if they are not level.
Your fridge will need a lot more than 4 amps to work. The one in my caravan takes nearly 10A at 12V.All three heat inputs (mains, 12V and gas) just drive the gas reabsorbtion circuit. Gas gives best result (as it has lots of heat) but mains doesn't do a bad job either.The 12V elements are not really man enough to properly chill the fridge by themselves. They will keep it cold once chiilled by gas or mains though but even so, will need 8 to 10A to do so.
what about these 12v coolers from like argos and maplins, only 12 volts, will they use less power, be thermostaically controlled (caravan 12v fridges arnt = full on all time) aslong as it cool im cool so to speak, keep me milk sausages bacon cool...
Maybe I'm missing something - but what's the connection between the fridge and the Lister engine?I'm going to assume there isn't one had have a go at splitting and merging topics to make a new thread, lets hope it doesn't make a mess (good to practise these things!)