ATC lights

Teamwoo
Teamwoo Forum Participant Posts: 24
edited May 2013 in Towcars & Towing #1
I have just purchased a new caravan with an AL-KO ATC device. My question is that when the ignition is off the green light stays on, this is fine but what happens when the caravan is left hooked up for any lengh of time will iit drain the car battery.
The reason I ask is that im off to France and have a 10hr crossing so the last thing I need is for the car not to start the other side. Should I disconnect it when on the ferry?