Trailer electrical connector DOA on New MYP

[GSP]

Yup, this is correct, per this article from @rypalmer above. Trailer Wiring Diagram – Lights, Brakes, Routing, Wires & Connectors

Looking at the linked wiring diagram, trailers that are required to have a trailer breakaway system need 12 V power on pin 6 to keep the system’s 12 V battery charged. When the trailer breaks away, this 12 V battery applies the electric trailer brakes.

Perhaps this is leading to some of the confusion about the need for 12 V aux power on pin 6 for trailers with brakes. Trailers without a breakaway system don’t need it, and use pin 5 to control and activate their electric brakes, but trailers that also have a breakaway system need to have both pin 5 and pin 6 functional.

GSP

 

[MindBlend]

Looking at the linked wiring diagram, trailers that are required to have a trailer breakaway system need 12 V power on pin 6 to keep the system’s 12 V battery charged. When the trailer breaks away, this 12 V battery applies the electric trailer brakes.

Perhaps this is leading to some of the confusion about the need for 12 V aux power on pin 6 for trailers with brakes. Trailers without a breakaway system don’t need it, and use pin 5 to control and activate their electric brakes, but trailers that also have a breakaway system need to have both pin 5 and pin 6 functional.

GSP

Yes, but as I stated earlier, most brake controllers use the 12v to run the brake controller. And yes, you are correct, I should have said 6th pin not 7th. Most systems require the 6th pin in order to run the 5th pin, assuming your vehicle doesn't have a built-in brake controller (which Tesla's do not)

 

[GSP]

Yes, but as I stated earlier, most brake controllers use the 12v to run the brake controller. And yes, you are correct, I should have said 6th pin not 7th. Most systems require the 6th pin in order to run the 5th pin, assuming your vehicle doesn't have a built-in brake controller (which Tesla's do not)

Yes, I agree there should be no problem powering a brake controller, which is installed in the tow vehicle, to 12-16 V power. The issue, I believe is trailers with a breakaway system. These systems require a 12 V battery mounted on the trailer. When the trailer breaks away from the tow vehicle, this battery applies the trailer brakes. The trailer’s 12 V battery needs to be maintained with a full charge, and that requires 12 V power on pin 6. 15-16 V power would likely overcharge the lead acid 12 V battery on the trailer, so a charger controller would need to be added to either the tow vehicle or trailer.

GSP

 

[Nitro187]

Uhhhhhh, Tesla STILL does not have a fix for this? My SC just informed me that they still do not have one. How in the world am I going to tow my trailer with proper electric brakes when I don't have power to the auxiliary on my trailer wiring harness? This is ridiculous!

 

[MindBlend]

Uhhhhhh, Tesla STILL does not have a fix for this? My SC just informed me that they still do not have one. How in the world am I going to tow my trailer with proper electric brakes when I don't have power to the auxiliary on my trailer wiring harness? This is ridiculous!

I just installed the tekonsha p3 controller and it worked fine despite it having 15.5 volts. It passes electric brake line. The 12v line in the back is still dead, but it should work fine. I'll test with a rented trailer soon.

 

[EV Obsession]

Is Tesla officially going to fix this? All I found the Tesla Canada’s article. Is there a place we can make a request?

I was hoping to use the aux power for RinseKit’s water heater this camping season.

 

[fiehlsport]

Wow... still no fix yet? Surprised there hasn't been an aftermarket product developed yet in this amount of time.

 

[MindBlend]

Wow... still no fix yet? Surprised there hasn't been an aftermarket product developed yet in this amount of time.

The tekonsha p3 controller I mentioned earlier seems to work just fine. The only thing you are going to miss out on is charging the trailers batteries while towing.

 

[mat1990dj]

Taking delivery of my MY in few days, this remains unsolved as I understand

 

[PhysicsGuy]

Interesting discussion. I am following.. Thanks all. (I just got an Model Y...

 

[W7PP]

I'm thinking about using the 7 pin plug to power the reflector replacing bumper lights. Are all the stop/turn/tail signals live on the plug w/o any action from the driver. Seems like an easier install than accessing the tail light assemblies... "A lazy man will find the easiest way to do things!"

21MYP.

 

[lolsups]

Taking delivery of my MY in few days, this remains unsolved as I understand

Not sure this is an issue on newly delivered vehicles.

 

[JayPaul]

I'm thinking about using the 7 pin plug to power the reflector replacing bumper lights. Are all the stop/turn/tail signals live on the plug w/o any action from the driver. Seems like an easier install than accessing the tail light assemblies... "A lazy man will find the easiest way to do things!"

21MYP.

I assume that your TMY will think you are in trailer mode constantly and you would have to turn off trailer mode each time you want to use Autopilot.

 

[W7PP]

JayPaul...whooops, you are correct! Well that idea lasted longer than most, the wife kills ALL the others ! Thanks for the correction...

 

[JayPaul]

JayPaul...whooops, you are correct! Well that idea lasted longer than most, the wife kills ALL the others ! Thanks for the correction...

Sorry it didn’t work out for you.

I left my 7-pin to 4-pin adapter (didn’t even have lights) in place, and it kept going into trailer mode.

Not sure which of the 4 pins makes it trigger trailer mode.