My worry about doing that was that it would flatten car battery. I'll do it next weekend when away (van lives in storage cos no room at home) but I'll be around to yours if my car wont start in the cold light of dayPlug it into your car? There shoukd be a permanent 12v supply from it. If your ATC cycles when you connect up then that proves it, so plug it in, go to bed and all sorted tge next morning. It won't flatten your cars battery.
Its 4 months old.Unless your car battery is on its very last legs it won't be a problem!
Many modern cars would "go back to sleep" when you lock the doors and set the alarm - ie disconnect the 12v supply to the trailer socket - so may not be practical to leave it unlocked for 12 hours.Plug it into your car? There shoukd be a permanent 12v supply from it. If your ATC cycles when you connect up then that proves it, so plug it in, go to bed and all sorted tge next morning. It won't flatten your cars battery.
