Tesla Issue!

[Hutch]

so what does the without brakes figure refer to?

That refers to a trailer without brakes, the type that you would use for taking rubbish to a tip.

 

[IanB1485]

It is an interesting conundrum , the Permanent 12V normally activates a relay(s) to cut off the caravans 12V systems , excluding the fridge control supply. The normal test is that when connecting up the car to the caravans' electrics the caravans awning light won't come on once the car is hitched. A second pin on the 13 pin connector has 12V on it when the cars ignition is on , The permanent 12V is then connected (by the fridges' control system) to run the fridges' 12V heater element ( 125- 150W) which the cars alternator can supply, no problem.
The difficulty is if you want the caravans leisure battery to supply the ATC electronics , which doesn't take a lot of current you must ensure the 'ignition On' pin hasn't got 12V on it otherwise the fridge may, if on automatic select 12V operation and this would flatten the caravans battery within a couple of hours which would also stop the ATC from functioning. as the battery flattens.On my PHEV the fitter took a fused supply cable direct from the battery (which is below the boot of the car) to the permanent 12V pin on the 13 pin connector. the unfortunate thing is he couldn't tap into the Cars CAN system to detect when the engine is running so the 'Ignition ON' pin has also got 12V on it all the time, which means when stationary and systems off ( service stations , ferrys e.t.c) I have to unplug the caravan to stop the cars 12V battery going flat trying to run the fridge.

 

[Firkle]

It might also be wise to check with your caravan insurance on the ATC not being connected. Mine states that a condition of the insurance is that the ATC must always be active when towing

 

[BrummyGit]

I just found this thread while searching for answers as to why my Tesla Model Y won't power the ATC on my new (to me) caravan. Has anyone been able to find a solution?

 

[otherclive]

I just found this thread while searching for answers as to why my Tesla Model Y won't power the ATC on my new (to me) caravan. Has anyone been able to find a solution?

That’s a pretty uncommon tow car. Can the towbar fitter advise? Tesla customer support are unlike to help as my grandson has the new Model Y and it makes a noise from its brakes when not braking. Bristol Tesla said it’s not dangerous and some do. He said his previous Tesla didn’t nor any of his previous cars. Eventually he found out there was a technical bulletin out and he told Bristol Tesla who were unaware. He's now having a mobile Tesla tech to come out and fix it. But since his employer has just gone into administration the car will be going back soon anyway.

 

[BrummyGit]

That’s a pretty uncommon tow car. Can the towbar fitter advise? Tesla customer support are unlike to help as my grandson has the new Model Y and it makes a noise from its brakes when not braking. Bristol Tesla said it’s not dangerous and some do. He said his previous Tesla didn’t nor any of his previous cars. Eventually he found out there was a technical bulletin out and he told Bristol Tesla who were unaware. He's now having a mobile Tesla tech to come out and fix it. But since his employer has just gone into administration the car will be going back soon anyway.

Unfortunately the Model Y is already our car, and the other family vehicle is a company car which only permitted a factory installed towbar which it doesn't have. Our towbar is fitted by Tesla and they advise that they do not provide the switched or unswitched 12v auxilliary connections used by ATC, Fridge etc. Until either vehicle comes up for change we will be using the Model Y.

I thought the recent Model Y brake noise issue was well known - as you say, mobile service will come out and resolve. I read that it's not a safety issue, just an annoyance. Our experience of Tesla service has been very good, although it's not really had any issues to speak of.

 

[Tobes]

Until you get to the newest version of the Y with the light bar headlight, the 12V supply is not attached on the 13pin connector. This is due to the voltage mismatch (Tesla does not use 12v, but a higher voltage).

 

[otherclive]

Here’s a link to a previous Tesla towing thread which discusses some “ideas” to get around the problem. If any worked it’s not clear. But there is also a link from Tobes to Facebook forums where others have confronted the same problem as you. But at the end of the day a heavy tug like the Tesla Y, at max tow load of 1600 kg and a noseweight of 100 kg should be a good stable outfit. ATC is an auxiliary system designed to help quash incipient snaking, not to render an unsafe outfit safe.

J

Thread 'Tesla Issue!'

Sep 23, 2024

Hello

So a few of you might have read my other post explaining that we’d just bought a caravan and drive a Tesla Model Y.

It was only when we came to hook the caravan onto the back of the car when I realised a problem with the ATC not working.

Turns out that the 13 pin plug on the Model Y doesn’t have the permanent 12V live that the ATC requires!

Not sure that there’s too many EV owners on here but want to ask whether there’s another way of getting this to work? Perhaps getting the ATC connected to the 12V leisure battery?

What else would that 12V feed from the 13pin plug usually...

• JCNUFC1991
• Replies: 32
• Forum: Technical