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Old 06-12-2020, 05:24 PM   #1
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2020 16' Nest
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Question Nest 16FB and Tesla trailer mode

We just got a 2020 Nest and have been towing it with our Tesla Model X with the towing package.

The Model X is supposed to automatically go to Trailer Mode when you connect to the 7-pin trailer connector, but for the Nest it does not, I have to manually set it. It does detect our little utility trailer, which has incandescent lighting. I suspect itís because the Nest uses LED running and brake lights.

Two questions-

Has anyone solved this?

Where is the terminal block located in the Nest that the 7-wire cable connects to, for distributing the wiring to the various lights? (If I know that I can try some experiments to improve trailer detection.)

Thanks for any help!
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Old 06-12-2020, 05:37 PM   #2
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Welcome to the forum!

FYI there is an extensive thread about towing with the Model X:

https://www.airforums.com/forums/f46...-x-160951.html

This thread raises similar issues to yours IMO:

https://www.airforums.com/forums/f23...up-152591.html

We test drove a Model X a couple of years ago FWIW, and here are some other electric tow vehicle threads of interest:

https://www.airforums.com/forums/f46...es-200767.html
https://www.airforums.com/forums/f46...le-169483.html
https://www.airforums.com/forums/f23...uv-189788.html

There should be an electrical schematic in your owner's manual.

Cheers,
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Old 06-12-2020, 07:46 PM   #3
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It is also buried in one of the threads linked above, but all you need is an adapter for LED trailer lights. Common issue on Euro vehicles that have trailer light bulb out detectors.

https://www.amazon.ca/Curt-57003-Tra.../dp/B00AFVOF3M
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Old 06-13-2020, 08:56 AM   #4
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Quote:
Originally Posted by OTRA15 View Post
Welcome to the forum!

FYI there is an extensive thread about towing with the Model X...
Quote:
Originally Posted by jcl View Post
...all you need is an adapter for LED trailer lights. Common issue on Euro vehicles that have trailer light bulb out.....
jcl & OTRA15,

Thank you! It seems likely this is the same issue, and much as I expected. There is indeed a schematic, but unfortunately it does not show the PHYSICAL location of the junction block. If I knew that, I could add the needed resistors right to it instead of getting the adapter cable.

I’m an electrical engineer and I almost certainly have the proper value resistors here already, it would be a much cleaner solution than the add-in cable.

I just need to know where the block is located in the trailer! Can you suggest where I might post to find this out?
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Old 06-13-2020, 09:52 AM   #5
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Originally Posted by tcmeyers View Post
jcl & OTRA15,

Thank you! It seems likely this is the same issue, and much as I expected. There is indeed a schematic, but unfortunately it does not show the PHYSICAL location of the junction block. If I knew that, I could add the needed resistors right to it instead of getting the adapter cable.

I’m an electrical engineer and I almost certainly have the proper value resistors here already, it would be a much cleaner solution than the add-in cable.

I just need to know where the block is located in the trailer! Can you suggest where I might post to find this out?
I don’t have a Nest, but do have the manual and parts book.

The manual states that the 12v distribution is built into the converter, under the fridge. I believe that this excludes the road lighting, however. If you look at the schematic it shows the road lighting as part of the Body Harness, noted to be spliced in to the 7 way plug at the front of the trailer near the distribution panel, which is a second reference to distribution. I would just follow the harness from the 7 way plug, and expect the splice under the front bed where the bus bars are, or possibly under the nose cone.

Jeff
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Old 06-13-2020, 10:17 AM   #6
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have you read this article from Andy at CANAM RV?
https://www.canamrv.ca/blog/post/tes...tream-trailer/
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Old 07-04-2020, 02:52 PM   #7
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Just to update, I did find the terminal block, and have likely solved the problem with less than $1 worth of parts, cleanly and permanently, no ugly add-on adapter cable. Iím about to head out on a road trip, and if itís trouble-free Iíll post photos and instructions.
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Old 07-10-2020, 03:08 PM   #8
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I did a separate post on how to do this with a few inexpensive parts.

https://www.airforums.com/forums/f23...ml#post2381700
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