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14-30 adapter not outputting correct voltage?

Discussion in 'Model S: Battery & Charging' started by silentsnow31802, Jan 19, 2017.

  1. silentsnow31802

    Joined:
    Feb 26, 2016
    Messages:
    136
    Location:
    Napa, Ca
    I have a 10-30 plug in my garage that I share with my dryer. I ordered cable to convert it from 10-30 to 14-30 so I can use my newly purchased 14-30 adapter to charge my car. It does not seem to work properly.

    I am getting 240V through the two hot sides but the neutral to hot I am only getting 8V. If I unplug the Tesla adapter I get the full 120V from each side. I have attached pictures of what I am on about. My 14-50 adapter I can get 120V on the UMC side of the adapter from each leg to neutral where on the 14-30 I am only getting 8V.

    Has anyone else used this configuration? 10-30 from wall to a 14-30 plug with the Tesla 14-30 adapter? It should work in theory right?

    I am wondering if my adapter has a problem.
     

    Attached Files:

  2. MP3Mike

    MP3Mike Active Member

    Joined:
    Feb 1, 2016
    Messages:
    3,632
    Location:
    Oregon
    I don't think the adapter has a neutral, it uses hot-2-hot to get the 240v. (It has no need for 120v.)

    The other pin would likely be ground, is your 10-30 adapter providing a good ground?
     
  3. silentsnow31802

    Joined:
    Feb 26, 2016
    Messages:
    136
    Location:
    Napa, Ca
    Sorry my terminology might not be the best here. I do not think the adapter is providing a good ground.

    Out of the 3 wires I seem to have 2 separate 120V hot wires that together make 240V and what I assume is the ground. If I go from one 120V to the other 120V wire I do get the 240V that it is supposed to have. When I go from one 120V wire to the ground I get 8 to 9V.

    If I do the same test at the plug itself I can get 120V out of each power wire to ground.

    Hope that makes sense.
     
  4. silentsnow31802

    Joined:
    Feb 26, 2016
    Messages:
    136
    Location:
    Napa, Ca
    DERP I figured it out....

    I hooked the Ground/Neutral wire from the 14-30 side to the neutral on the 10-30 side instead of the ground. Swapped it and its working fine now.
     

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