Soggy 13 pin plug problem

ABIPete
ABIPete Forum Participant Posts: 88
edited January 2016 in Parts & Accessories #1

Hi all we have just got back from checking the caravan at the storage site. I found the alarm light flashing a code to indicate the 13 pin plug had been interfered with. I checked and found the lead had dropped down from under the tow hitch cover. I removed
the green alignment cover that I leave on, to find the whole lot full of water and very rusty, even the plated pins were brown. I have dried it all out and sprayed with WD 40 but I think I will need to replace the plug. Are some of better quality than others?
After resetting the alarm it has stayed OK.

Comments

  • rogher
    rogher Forum Participant Posts: 609
    500 Comments
    edited January 2016 #2

    I’d risk using the existing plug and see how it goes. Clearly the fault was due to it getting so wet and you seem to have resolved that.

    I’d encourage you to check the state of your battery, though, and recharge it if it is at all low.

  • ABIPete
    ABIPete Forum Participant Posts: 88
    edited January 2016 #3

    Thanks rogher, the battery is OK, it is kept topped up by a 100watt solar panel. The condition of the pins in the plug looks poor, many are brown, and not the silver of the others and it does not wipe off. I did dismantle the plug and found some of the screw
    fixings for the wires are rusty as well. If I plug it into the socket on the car it will contaminate them as well. I have wondered how the water got in as the gland where the wire enters was screwed up tight. It must have entered around the rotating part of
    the barrel, there is an o ring but I think that is where it came in, and could not drain out as the alignment cover cap was on and has a rubber seal. The lead was hanging down over the side of the A frame, I had tucked it under the cover but somehow it had
    fallen down.

  • rogher
    rogher Forum Participant Posts: 609
    500 Comments
    edited January 2016 #4

    In that case, I’d replace the plug and, to answer your original question, I’m sure there are variations in quality. Having understood the shortfalls of your existing one I’d check that a replacement is unlikely to suffer the same result. The grommet that
    the cable feeds through at the back of the plug should be a tight fit. You may need to lubricate it (spit) to get the cable through. 

  • EmilysDad
    EmilysDad Forum Participant Posts: 8,973
    1000 Comments
    edited January 2016 #5

     ..... I did dismantle the plug and found some of the screw fixings for the wires are rusty as well. ....

    I generously apply silicon grease inside both plug & socket .... it helps if you ever need to remove either. 

  • Nuggy
    Nuggy Forum Participant Posts: 512
    edited January 2016 #6

    I have seen two types of socket, one had silver coloured pins and the other had pins that were either brass, or brass coloured. Obviously if they are brass then being non ferrous would make better contacts. Ask at your local towbar fitter if any are actually made with brass pins. If your pins have become discoloured and rusty, then they aren't brass

  • Nuggy
    Nuggy Forum Participant Posts: 512
    edited January 2016 #7

    Apparently some with silver pins are actually Nickle plated brass. Worth asking about if buying a replacement socket.

  • ABIPete
    ABIPete Forum Participant Posts: 88
    edited January 2016 #8

    Thanks all for your replies. When we bought the van a year ago I asked them to change the two 7 pin plugs for a single 13 pin as our car already had the 13 pin socket. They fitted a complete new plug and single cable back to the wiring connection in the
    caravan at no charge; however the caravan It is now just out of wty! But I will ask them about the problem. I will try and look for a better quality plug and work out how to make sure the plug and cable stay under the cover in future!!

  • Nuggy
    Nuggy Forum Participant Posts: 512
    edited January 2016 #9

    I lay mine on the slot which allows the Hand brake to move, spray with WD40 and don't leave the green cover on, to trap any water in. 

  • ABIPete
    ABIPete Forum Participant Posts: 88
    edited January 2016 #10

    I went back to the caravan storage site yesterday and have arranged for the plug to be replaced when the caravan has it's service soon, they have a trained service engineer on site. I have also wrapped a bungee cord around the wire to stop it moving from under the cover.It is so frustrating not to be able to change the plug myself but I have very active psoriasis on my fingers which makes doing this too painful at the moment! I spent nearly all my working life repairing photographic equipment; so wiring a 13 pin plug would not worry me.

  • ABM
    ABM Forum Participant Posts: 14,578
    1000 Comments
    edited January 2016 #11

    Be  careful  about  which  WD40  you  use  on  plastics !  the  original  type  softened  some  plastics  so  look  for  the  "Silicone"  version  ==  personally  I  use  a  liberal  coating  of  petroleum  jelly  ( aka  Vaseline )  that  only  softens 
    my  size  11  hands  !

  • ABIPete
    ABIPete Forum Participant Posts: 88
    edited January 2016 #12

    Thanks for the reminder ABM, I was aware of that, it can also damage the O rings as well. But as the plug was in such a mess it was not going to make much difference.