AL-KO ATC

Power drawn by ATC is negligible so no need to worry for the length of time re- ferry crossing 

Unplug the 13pin plug if worked about power drain. With a note on your tow vehicle steering wheel to reconnect. when called to car decks

Thanks for this. Technical people at CMC hadn’t had the question before but recommended disconnecting the 13 pin plug as there may be other drains on the power supply apart from the ATC. 

 ... Technical people at CMC hadn’t had the question before but 

I'm surprised🤷‍♂️  because the question has been raised here a few times

We used the ferry from Plymouth on an 8 hour crossing and left the car connected when we set off from the ferry the ATC red light was on. We pulled over and disconnected for 1/4 hr or so and reconnected all was then fine. Our family also had their van and they had the same problem.

I think during the crossing the motion of the ferry must have repeatdly activated the ATC, on the way home we disconnected and no issues green light all fine. 

 

I disconnect our 13 pin connection and pull on the brake on ferry trips, thankfully the plug is well positioned to do so, it's not a crawling on hands and knees task.

But with your set up that is the case.

An alternative to server the connection is to pull the car's fuse serving that maintained feed. Again, in my case that would be a readily achievable task, as access to fuse is easy, it is located in a hatch on the "boot" side.

It might be worth exploring if doing that is something your setup offers.

I am not convinced breaking the feed is needed, but as it brings no benefit and can only sap some power and presents an unwanted risk, I prefer to uncouple ours. i leave a window cleaning micro cloth knotted on the wheel just in case my memory should ever fail me about coupling up and taking off the brake.

The user and all related content has been Deleted User

I saw last week when leaving our caravan connected up for a quick get away on a one night stop our battery was down to 12.3V. I was surprised as normally a lot higher and realised the ATC was the draw down. Ok since and now I will always disconnect the plug.

My worry was that if we needed heating the fan is 12v driven even though we had gas hot air. (On a non electric cl)