I purchased a Model Y Performance in June of last year and opted ot not have the trailer package installed. A year later I've come to realize how useful it would be to tow a trailer with my Y, so I spent some time scraping this site and others on guidance in building a trailering harness that uses the OEM connector under the bumper cover. While for sure you can go buy a Curt harness kit and clip it to your lights, run power etc... I wanted a cleaner solution.
Kudos to gman99 who got me started down the right path on finding a connector that will fit on the existing trailer harness connector installed on all(?) Model Y's.
To build the connector you will need:
- 1X Molex Connector (Male) Part Number: 34986-1601
- 7X Molex Automotive Connector Pins (Male) Part Number: 31296-0008
- Some Molex automotive crimping tool
- 16 gauge wire
Here are the application notes from Molex explaining assembly of the connector:
https://www.molex.com/pdm_docs/as/AS-33472-100-001.pdf
And the pinout for the tesla connector is:
- Black (corner): Unknown
- White: Ground
- Not Used
- Red: Brake Lights
- Blue: Unknown
- Not Used
- Not Used
- Red (corner): 13V Supply
- Purple (corner): Unknown
- Black: Unknown
- Not Used
- White: Reverse Lights
- Brown: Running Lights
- Purple: Passenger's Blinker
- Green: Driver's Blinker
- Blue (corner): Unknown
The pinout for a standard 4 or 7 pin trailer hitch is easy to get from google or whatever connector you end up buying. I went with this:
https://www.amazon.com/gp/product/B07YZ16N5D/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
Slap together both connectors (male tesla connector + 7 or 4 pin universal trailer harness) and you have a working Trailer harness. Note that this likely will have limited functionality - and of course choose your gauge carefully based on the requirements of your trailer lighting. Choosing incorrectly may result in fire or something like a dead tesla...