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His vehicle is an Isuzu pickup Euro 6 plus with smart alternator. So far he has had a professionally run a direct feed in 2.5mm plus split charge relay from positive and negative on the truck battery to the 13 pin, didn’t work. Has had the factory fitted towing electrics removed and a completely new wiring installed by Brinks, no good. He is getting vehicle battery volts at the vehicle 13 pin socket. Wildside charger has the correct specification to take 12.2 volts and boost up to 14v, I think? We are of the opinion that there is something very wrong with the internal wiring on the Adria as it should be a simple matter of connecting it the correct side of the habitation relay or you can even bypass that relay. My own issue may be a faulty pcb on the fridge as following Thetfords instructions to connect a dc supply direct to the fridge I cannot get the fridge to work. The Adria main dealer, Venture Caravans, have worked on this for a week and still cannot get the battery to charge or the fridge to work.
Same way your mobile phone or tablet knows which way is up....I guess... My Skoda has a hill start facility that holds it for a couple of seconds once foot off the brake before pressing the accelerator....