Adivce required re fitting 12V sockets

Discussion in 'Tech/Mech General' started by lorger, Mar 10, 2016.

  1. lorger

    lorger Funster

    Joined:
    Jul 11, 2008
    Messages:
    6,189
    Likes Received:
    7,555
    Location:
    Dumfries
    A few weeks ago I posted that I was need a couple of 12v sockets and USB sockets, well they came today and I thought I'd have a quick look at the job. There's a 12V junction box just where I want to fit the sockets and assumed it would be positive to positive and neutral to neutral or is it called negative.

    Opened up the 3 junction boxes and slightly confused so thought I'd ask the experts.

    First box has a few connectors in it two to the right hand side have green in to them
    One has several brown going into it and the other several blue, now the bit that confuses me the one with the brown going in has a blue coming out to nearby light and one with blue in has brown out to light so what way round do I connect my two wires.
    image.jpeg
    The other two boxes in the pics below one is the same brown in blue out and blue in brown out and the other one is as I thought they would be brown in brown out and blue in and out. image.jpeg

    image.jpeg

    So how do I work out what way to wire the sockets, I know this might be simple to some of you but please explain it to an idiot.
     
  2. Badknee

    Badknee Funster

    Joined:
    Aug 25, 2014
    Messages:
    3,642
    Likes Received:
    15,240
    Location:
    notloB
    It seems the laws of lektrickery in Moho's is completely different to household stuff.
    The brown may well be negative and blue positive so then you add something that may be red positive and blue negative so things are swapped around instantly.
    A meter may well be needed to find out which is positive and negative in your Moho.
     
    • Like Like x 1
  3. StitchesnFluff

    StitchesnFluff Funster

    Joined:
    Oct 18, 2014
    Messages:
    1,206
    Likes Received:
    508
    Location:
    Salisbury
    A meter might be initial option to find out what's what & maybe draw out wiring diagram of van
     
  4. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,461
    Likes Received:
    16,895
    Location:
    YO11 2BD
    Use a volt meter.

    Those colours are 230v colours, not regular 12v.
    Some clown may have used 230v flex instead of 12v single conductors.....but I wouldnt take a chance of banging mains voltage inro a 12v socket.
     
  5. lorger

    lorger Funster

    Joined:
    Jul 11, 2008
    Messages:
    6,189
    Likes Received:
    7,555
    Location:
    Dumfries
    Just so you know it's a brand new van German built.
     
  6. Techno

    Techno Funster Life Member

    Joined:
    Jul 28, 2010
    Messages:
    13,853
    Likes Received:
    14,508
    Location:
    Leeds the one up North
    Yes as Paul said you need a meter and preferably an electrician.
    The first box at least looks like 230 volts given the greens are most likely earths
     
    • Like Like x 1
  7. Techno

    Techno Funster Life Member

    Joined:
    Jul 28, 2010
    Messages:
    13,853
    Likes Received:
    14,508
    Location:
    Leeds the one up North
    I'll give you some time/assistance at Chester if you want to wait.
     
    Last edited: Mar 10, 2016
    • Like Like x 1
  8. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,867
    Likes Received:
    2,686
    Location:
    Kendal, Cumbria
    My Hymer uses mains colours for the 12v circuits. For 12v BROWN is used as 0v ('earth') and BLUE is used as +12v.
     
    • Like Like x 1
  9. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,461
    Likes Received:
    16,895
    Location:
    YO11 2BD
    Poor practice in my book.
    By all means use the same colours, but not mains flexible cable instead of proper 12v automotive wiring....too easy to confuse the mains and 13v circuits.
     
    • Like Like x 1
  10. lorger

    lorger Funster

    Joined:
    Jul 11, 2008
    Messages:
    6,189
    Likes Received:
    7,555
    Location:
    Dumfries
    Thanks Andy I'm in no hurry so might just take you up on that offer. I thought the same with the first box even though it says 12V on the box, and the blue brown does go to a 12V light. I'm back at work tomorrow so might ask the shift control guy for advice.
    I have a Satellite coming next week so expect more questions :)
     
  11. lorger

    lorger Funster

    Joined:
    Jul 11, 2008
    Messages:
    6,189
    Likes Received:
    7,555
    Location:
    Dumfries
    This is what I though but got confused when they had wired blue to brown and vice versa
     
  12. Techno

    Techno Funster Life Member

    Joined:
    Jul 28, 2010
    Messages:
    13,853
    Likes Received:
    14,508
    Location:
    Leeds the one up North
    The third picture is ridiculous
     
  13. Jimbohorlicks

    Jimbohorlicks Funster

    Joined:
    Sep 3, 2012
    Messages:
    640
    Likes Received:
    822
    Location:
    Cheshire
    maybe if the wires go to an LED light they have been changed around +/- rather than changing the bulb around -/+ but easy to check with a multimeter
     
  14. Don Quixote

    Don Quixote Funster

    Joined:
    Jul 29, 2012
    Messages:
    2,498
    Likes Received:
    3,696
    Location:
    Lost in La Mancha, Spain
    Andy, looks like a "bodged" job, but I'm sure you will have it sorted in no time.
     
  15. EssexBoy

    EssexBoy Funster

    Joined:
    Feb 5, 2009
    Messages:
    314
    Likes Received:
    203
    Location:
    South Essex
    Just thinking out loud. The blue brown to the light wouldn't be the switched live would it?
     
  16. laird of Dunstan

    laird of Dunstan Funster Life Member

    Joined:
    Feb 15, 2015
    Messages:
    1,138
    Likes Received:
    3,059
    Location:
    lincolnshire
    dont go guessing! ,use a meter and check for polarity,0v and earth are two different things ,you will find 12 v positve (assuming that its 12v) between the live feed and both the 0v and the earth,in all probability the green is the earth,if in doubt get a sparkie to check.
     
  17. Minxy Girl

    Minxy Girl Funster Life Member

    Joined:
    Aug 22, 2007
    Messages:
    8,521
    Likes Received:
    9,887
    Location:
    E Yorks
    For goodness sake you lot ... it's a Globecar! Ours are exactly the same - it's just how they do them.

    Another Globecar owner on this forum told me about it when we bought ours, he said:
    Its quite easy to use a tester to check which is which and the stick your cable in accordingly ... just ensure that you get the end right in before you push the clip down to get a good tight fit - much easier than the way some other MH makers do their electrics!
     
  18. maxi77

    maxi77 Funster

    Joined:
    Mar 20, 2013
    Messages:
    248
    Likes Received:
    135
    Location:
    Kingdom of Fife
    In my experience it is standard practice in Germany to use blue and brown for 12 volt circuits. they do though keep then apart from 230 volt circuits which all have 3 core cable. A meter will quickly tell you both the type of power and polarity for DC
     
    • Like Like x 1
  19. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,867
    Likes Received:
    2,686
    Location:
    Kendal, Cumbria
    It's a motorhome - they don't do good wiring practice.:)
     
    • Like Like x 1
  20. Minxy Girl

    Minxy Girl Funster Life Member

    Joined:
    Aug 22, 2007
    Messages:
    8,521
    Likes Received:
    9,887
    Location:
    E Yorks
    They are 12v only ... they don't 'combine' 12v and mains. Globecar have a different colour scheme for their electrics - see my post above.
     
Loading...

Share This Page