steilkurve
Member
Thanks again. And I assume a tester like the below would tell me if mine is fine?
7-Way RV Blade Connector Tester (Packaged)
-
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Tesla stopped supplying 12V power to the aux pin of the 7 way - Fixed!!!
- Thread starter ShawnA
- Start date
Thanks again. And I assume a tester like the below would tell me if mine is fine?
7-Way RV Blade Connector Tester (Packaged)
steilkurve
Member
fcharland
Member
Can anyone confirm if it’s possible to use a higher amp fuse (131) from 15A to 20A. My electric trailer jack uses 20A and I wasn’t aware until the moment I tried using it and blew the fuse. This happened while at Tesla service. The tech said he can’t comment as it isn’t to spec and Tesla can’t be liable. He was nice enough to replace it with another 15A fuse, which would’ve been illegal to drive without trailer lights.
fcharland
Member
So...I confirm that my September 2017 X75D had the same problem described in the first post. I followed the procedure and placed the red wire in its place and everything is fine now.
Just want to add a small detail... September 2017 is around the time where the tow package became standard equipment and my X didn't have it even if it was supposed to have it. So my tow package was installed at the service center shortly after delivery. It became back ordered for months in US/Canada shortly after that.
Hi Steinmetz,
We have no way of knowing what is in your car...
If you use the tester in post 21 or a Curt 58270... All available on Amazon For $8 to $15...
Those are not typos it's from eight to fifteen dollars for a tester for you to check...
Otherwise go to your hitch equipment supplier and they will test it for you, most likely free...
Shawn
We have no way of knowing what is in your car...
If you use the tester in post 21 or a Curt 58270... All available on Amazon For $8 to $15...
Those are not typos it's from eight to fifteen dollars for a tester for you to check...
Otherwise go to your hitch equipment supplier and they will test it for you, most likely free...
Shawn
You can test easily, but my recent raven model did not have the 12v hot so I doubt yours does. Was an easy fix though.
My X is currently in service for having significant issues while in trailer mode. Lots of error messages including Power Limited. They believe that it is related to the trailer "back feeding 12 Volts" to the car. I had the 12V made hot by the Littleton Service Center earlier this year and it seems that may not have been done correctly. But, Tesla is now blaming my trailer.
Any ideas?
Any ideas?
Hi Brave Ulysses,
You have good trailer service out there...
Double check with them, advise what Tesla says and see if they
are able to fit the trailer or the harness with a diode to prevent back
feeding the car.
It should be easy to fix that...
Whether that fixes the problem or not is another question...
Good luck,
Shawn
PS - These diodes are pretty common to prevent the car from draining power from the trailer.
You have good trailer service out there...
Double check with them, advise what Tesla says and see if they
are able to fit the trailer or the harness with a diode to prevent back
feeding the car.
It should be easy to fix that...
Whether that fixes the problem or not is another question...
Good luck,
Shawn
PS - These diodes are pretty common to prevent the car from draining power from the trailer.
@Brave Ulysses posted this in his original thread. Mobile service came out and "fixed" the problem.
#16
If this is really the problem then wouldn't we be seeing it more widespread? Lots of people have applied the original fix and not had this problem. Only see one other mention.
#16
If this is really the problem then wouldn't we be seeing it more widespread? Lots of people have applied the original fix and not had this problem. Only see one other mention.
I have a 2020 Mx and the SC in our area in California are clueless about this issue. Would you mind sharing the description of their fix? Like part numbers etc? So appreciate you bringing up this topic.
Hi @Rheddysetgo ,
The harness with the 7 blade connector Tesla part 1046032-00-C
will need to be removed from the car.
That is a fairly easy task...
The large Red wire needs to be moved to opposite end of the plug.
It is the position currently occupied by the blue plug.
Then the blue plug closes the hole the red wire came from...
The picture below shows the FINAL CORRECT position of the wires
in the plug.
Sorry for the dirt, it has been 2 years since the fix was applied.
Good luck,
Shawn
The harness with the 7 blade connector Tesla part 1046032-00-C
will need to be removed from the car.
That is a fairly easy task...
The large Red wire needs to be moved to opposite end of the plug.
It is the position currently occupied by the blue plug.
Then the blue plug closes the hole the red wire came from...
The picture below shows the FINAL CORRECT position of the wires
in the plug.
Sorry for the dirt, it has been 2 years since the fix was applied.
Good luck,
Shawn
davezforce
IG @davezforce
Thank You to the OP for doing the leg work and this post. I bought the Curt Echo brake controller and could not get it to pair with my phone. After finding this thread it was indeed the lack of 12v. I followed the instructions provided in this post and everything now works perfectly. Thanks Again!
Hi.
I have a 2021 MX LRP (build date 2020-11).
I has this same issue. I am stunned that Tesla has not fixed this yet.
It is easy to remove the trailer harness connector to the 7 way connector and then move the red wire to the other position on the tesla connector side.
Also note that the +12V is only on when the car is on. It was on all the time in my 2016 MX90D.
I really like having the +12V on all the time, even when the car is off, so that I can leave a powered cooler outside the car while camping.
So....
Since I don't use electric trailer brakes much, I went into that area (under the dash) and plugged in the connector for the trailer brakes. Then I wired together the +12V and the Brake Output of the pigtail of the trailer brake controller connector. Note that this +12V supply to the trailer brake controller under the dash is on all the time and does not shut down when the car is off.
This way I just pull power off the trailer brake terminal at the 7-way trailer connector for my cooler. Note that this uses all the normal wiring of the tesla and is fuse properly (so I didn't have to mess with anything).
YES, I do know that if I plug into a trailer with electric brakes it will lock them on full. So this is only a solution for those who know exactly what they are doing.
Lukas
I have a 2021 MX LRP (build date 2020-11).
I has this same issue. I am stunned that Tesla has not fixed this yet.
It is easy to remove the trailer harness connector to the 7 way connector and then move the red wire to the other position on the tesla connector side.
Also note that the +12V is only on when the car is on. It was on all the time in my 2016 MX90D.
I really like having the +12V on all the time, even when the car is off, so that I can leave a powered cooler outside the car while camping.
So....
Since I don't use electric trailer brakes much, I went into that area (under the dash) and plugged in the connector for the trailer brakes. Then I wired together the +12V and the Brake Output of the pigtail of the trailer brake controller connector. Note that this +12V supply to the trailer brake controller under the dash is on all the time and does not shut down when the car is off.
This way I just pull power off the trailer brake terminal at the 7-way trailer connector for my cooler. Note that this uses all the normal wiring of the tesla and is fuse properly (so I didn't have to mess with anything).
YES, I do know that if I plug into a trailer with electric brakes it will lock them on full. So this is only a solution for those who know exactly what they are doing.
Lukas
