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 Topic: Charging the caravan battery whilst towin
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27/4/2018 at 10:21pm
Location: West Yorkshire
Outfit: Bessacarr Cameo 625 2011
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Quote: Originally posted by Daves mate on 27/4/2018
Ok. So if I've got this right the fridge will only run on 12v while the van is plugged into the car with the engine running. The fridge will stop working as soon as the engine stops?
I'd assume that as long as the fridge door is shut it will stay cold for a good few hours.
That is correct. There are two possible scenarios: the old style split charge relay has a power supply taken from an ignition controlled point in the car. The relay only operates once the car voltage reaches a given value, so once the engine is switched off, power to the fridge is cut, thus preventing the car battery from going flat.
Modern cars can still use the old relay, but are better fitted with a dedicated module, that does the same job, but also cuts supplies to the cars brakes lights, fog lights, and reverse lights to avoid glare. Also any rear parking sensors are de activated.
When the 7 or 13 pin plugs are connected, the caravans habitation relay is activated, to cut the operation of 12 equipment , other than the fridge when towing, This to avoid any chance of caravan kit causing interference with the towcars electronics, for safety reasons.
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