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Convert SAE J560 7-pin to 4-pin trailer wiring

Discussion in 'Model X' started by Beta V, Jun 24, 2018.

  1. Beta V

    Beta V Author, Dad, Mentor, Technology Critic

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    Redmond, WA USA
  2. P100DHG.

    P100DHG. Supporting Member

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    Burbank, CA
  3. ewoodrick

    ewoodrick Member

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    Buford, GA
    My first suggestion, go to Walmart, they have a lot of stuff like this. Then check out some auto places that also sell hitches. Hitch places are like Superchargers, you never know they existed until you look.
     
  4. Beta V

    Beta V Author, Dad, Mentor, Technology Critic

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    Location:
    Redmond, WA USA
    The connector worked fine.
     
  5. posity

    posity Member

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    Jun 30, 2018
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    Location:
    Portland, Oregon
    For future reference for other folks wanting to connect their trailers, it is better to buy the 7 pin to 5 pin adapter even if your trailer only has the 4 pin connector. You can plug a 4 pin connector into a 5 pin adapter with no problem (so the 5 pin adapter will work fine with either 4 or 5 pin connectors), and if you ever end up towing a trailer that has disc brakes, you MUST have the extra 5th pin to be able to back up the trailer. Trailers with a surge actuator and disc brakes (very common) will lock up tight in reverse so it is impossible to back the trailer up even the slightest incline - unless the extra fifth wire on your trailer wiring is connected to your reverse lights, which tells the trailer (solenoid) to disengage the trailer disc brakes while you are in reverse.

    So it's worth one big bad extra buck to get a 7 pin to 5 pin adapter (just in case you ever end up towing a trailer with disc brakes):
    https://www.amazon.com/MICTUNING-Heavy-Trailer-Adapter-Weatherproof/dp/B07DPPDCSZ
     

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