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Tow connection power source

Discussion in 'Model X' started by SteveGrey, Apr 23, 2017.

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  1. SteveGrey

    SteveGrey Member

    Joined:
    Oct 26, 2016
    Messages:
    31
    Location:
    Kodiak, Alaska
    So random somewhat technical question... is the 12v power lead on the trailer 7 pin connector switched or always on?

    If it stays always on, it could be a convenient way to keep a travel trailer powered during dry/boondock camping for extended trips. If we could arrive at the site with the MX even moderately charged, car would power the trailer for weeks with typical loads. My previous camper had 200 watts of solar with dual group 27 batteries, but obviously this can't compete with a 100kwh battery feeding the step down D.C.-D.C. Converter.

    Second question, if it is switched power, does it come from the accessory rail with the 150watt limit or does it have a separate relay?

    Kind of random, just trying to figure some things out prior to taking delivery in July.
     
  2. qadaemon

    qadaemon Member

    Joined:
    Jul 29, 2016
    Messages:
    255
    Location:
    Sidney IL, Cape Canaveral FL
    Mine is switched. You can bypass it by putting the car in N and activating the parking brake. It is an early 90D, so it might not be the same as the current builds.

    Unless you're only running an LED or two inside, I wouldn't count on the trailer wiring to provide much power to your trailer. It's mostly there to keep enough power for the electric brakes, and really isn't large enough gauge wire to do much more than that. You would be better off using the jumper terminals, but I don't know how feasible that is either.
     
    • Informative x 1
  3. SteveGrey

    SteveGrey Member

    Joined:
    Oct 26, 2016
    Messages:
    31
    Location:
    Kodiak, Alaska
    Thanks for the info. I was thinking primarily power to keep the trailer battery topped up, but sounds like the pin wouldn't be sufficient for running a medium to large inverter.

    Thanks for the help!
     

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