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Yes, works on 12v with engine running,Have you got 12 volts present at the fridge with the engine running ?
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As above.. 12v is for when engine is running and helps maintain temp while travelling.
It does not cool, just help to maintain the temp..
Many fridges, mine included, cool very well on 12v. There is no thermostat so runs continuously and a theoretical risk of freezing if driving round the clock. The improved airflow over the back of the fridge while moving is possibly a factor as my previous MH had the bottom vent on the side of the MH and the top vent on the rear, leading to a howling gale over the back of the fridge when moving. I have had many motorhomes and the fridges all vary, even if the same model of fridge. My present one is at it's least effective on mains.
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They are usually poor on 12v because no MH converter uses cable of sufficient cross-section - so the fridge is lucky if it sees more than 10 or 11 volts. The element is the same wattage as the mains one (give or take) so will produce the same amount of heat. Run a decent cable for it and it will freeze the fridge contents on a full days drive.I was always lead to believe they "maintain" after reading previous posts and FAQ on websites..
Always like to stand corrected.. To be honest i dont think I have ever switched ours to 12v in 5 years, just fire up the gas when we stop..
Mine is rubbish once you get into Spain and a bit of heat, will have to look at fitting some of those fans.
Sorry Jockaneezer, it means you are a numpty
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A bit of a sweeping statement I think you must referring to British built Motorhomes as the cables size in the 3 German van we have had are more than large enough for the job.They are usually poor on 12v because no MH converter uses cable of sufficient cross-section - so the fridge is lucky if it sees more than 10 or 11 volts. The element is the same wattage as the mains one (give or take) so will produce the same amount of heat. Run a decent cable for it and it will freeze the fridge contents on a full days drive.
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I fitted a socket near the hab door to run a cool box. I wired it to the fridge feed so it would only operate when the vehicle was moving. One of those cheap plug-in voltmeter s (checked with a multimeter) never sees more than 11.5 volts. The van is 2005 Hymer. Previous MHs have never achieved 12v either. For the industry standard 3‰ volt drop over 5m the minimum cable size is 6 sq mm.A bit of a sweeping statement I think you must referring to British built Motorhomes as the cables size in the 3 German van we have had are more than large enough for the job.
The red & white wires are the main 12v to my fridge.
View attachment 158616
Just checked my Hymer, 12.9 v at the fridge with the engine running. If I switch the fridge to 12v so it's running off the habitation batteries it drops to 11.9v but with the 15 amp load and no charging the hab batteries are pulled down to 12.4vI fitted a socket near the hab door to run a cool box. I wired it to the fridge feed so it would only operate when the vehicle was moving. One of those cheap plug-in voltmeter s (checked with a multimeter) never sees more than 11.5 volts. The van is 2005 Hymer. Previous MHs have never achieved 12v either. For the industry standard 3‰ volt drop over 5m the minimum cable size is 6 sq mm.