Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
  • Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
  • We are looking for another podcast participant who can act as a lead co-host to join the TMC Podcast. If you are interested in participating please see this thread.

2020 Model S Trailer wiring question

Trying to setup the 2020 S to tow a lightweight motorcycle trailer to haul a dirt bike. Installed a stealth ecohitch from torkcentral and while their packaging was poor and lot of hardware was missing when arrived, install went without a hitch (ha). I even kept my re-inforcement bar for 3rd row passengers.

I ordered the tekonsha wiring kit for trailer lights. Buddy and I can't figure out the right color wires in the 2020 to tap for brake light and turn signals. Anyone know? I found some previous threads, but they only refer to older Model S cars, as do all the youtube videos. None of the color wires mentioned in them match what I have in the 2020 tail light harness.

Help would be appreciated if anyone has done this before.


Last edited:
OK update - I used trial and error and found the left and right turn signal wires. They work consistently. The running light wire remains unconnected, however I am getting running lights consistently. The only issue is brake lights. I found a wire that triggers them but its inconsistent. They mostly come on when you brake, but sometimes they don't. At present I am getting around this by using a smart bicycle tail light that has an accelerometer built it. It just automatically brakes when it senses you are slowing down - wireless and rechargeable so I just have it zip tied to the trailer and its working well.

Model S makes a great light duty tow vehicle. I am doing about 375 wh/mile towing a single dirt bike and lightweight kendon trailer.





About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.