Driving with fridge on

Indeed it is and that would be the only time the fridge would run on 12 volt, if it ran otherwise it would flatten the battery in no time without the vehicle's alternator powering the battery

Hello and welcome to CT and our great hobby.

Yes your fridge should have a battery icon, click to that for 12v from the engine whilst driving. Don't forget to swop it onto gas or electric once the engine's off. It can happen 

You can pre chill your fridge if you keep it at home, the 12v isn't enough to bring the temperature right down. We have never had the luxury of pre chill and have never had an issue, frozen stuff still frozen - but you can always add an ice cube, in a container, if you're in any doubt. Fill your fridge as tightly as you can with already cooled food and frozen bits. You can even freeze cartons/bottles of milk/water/juice to fill in the gaps 😉. Shut and lock the door, if the door opens contents can join you up front . Open as little as possible, we still make lunch and drinks on route, as it becomes a cool box.

Plenty of advice on hear dont be afraid to ask 😀

On the milk bottles/containers we havee seen it says do not freeze

Always freeze blue top at home , sink of cold water to defrost never had a problem .Dont freeze tins of lager .yes they expand and burst ,hurts ears when told wife !!!

I’ve frozen semi skimmed milk plenty of times with no issues at all👍🏻

+1, it coats your teeth in fat🤢

I never thought of that JV👍🏻👏🏻👏🏻👏🏻👏🏻👏🏻🤣

I empty half the milk container into another and then freeze both. Plenty of room for the frozen milk to expand. Probably doesn't need that much room so you might want to experiment.

Aaaah, Things ain't what they used to be JVB !

In my , admittedly distant, school days it was nothing to see a whole crate of 1/3 pint glass milk bottles with ' ice cream lollies ' sticking out of the top 

There is no cream in milk now ,full milk my a..e  when i was a milkman bottles of sterra ripped youre fingers apart ..put caps on milk so birds couldnt peck through ,, Sound like my dad now !!!

Gold top is still alive and cholesterol full in good stores

Sorry to butt in on the milk top discussion that this thread has become but a small point about the actual original query.

Some vans (especially camper vans) have a compressor fridge which is like a domestic fridge and runs on electricity all the time being 12v off the habitation battery which will normally be topped up by the alternator when the vehicle is running.

The advice to read the vehicle handbook is good. A compressor fridge wont have a mode switch to select mains/gas/12v. Either way running on 12v on the move is fine.  

As you suggest, one possible cause is inadequate wiring if you have 12 volts to the fridge. Ideally your fridge supply should be a separate (fused) feed directly from your battery ... obviously via a relay and your caravan should have two separate 'earths'. Depending on where your trailer electrics were fitted, it does happen that they use the feed to the boot light as the feed fro the fridge/charging, which is obviously way too small.

thank for your input, I was wondering if the power board was at fault but at a replacement of £115 I hope not but I get the same fault when running the fridge from the leisure battery which makes me wonder if it is the power board....the fault finding continues