DC power in habitation area whilst engine running

Discussion in 'Tech/Mech General' started by Old Soldier, Nov 22, 2015.

  1. Old Soldier

    Old Soldier Funster

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    Hi folks. I have only had my van for 12 years and I have now just discovered that the 12v supply to lights and sockets in the back of the van are disconnected when the engine is running!! I was trying to set up a rear view wireless camera and it needs a 12v supply. I know that this can be obtained from a connection with the reversing lights but I was trying to get a constant picture. Firstly, is that feasible, has anyone else done it?. Secondly, is there a way of getting around the isolation of the 12v habitation supply, and again, is that safe to do?. I realise I can take a separate 12v cable from habitation battery direct to camera but it seems to contradict the advantages of the wireless camera.
    Thanks, in anticipation.
    Pete.
     
  2. Don Quixote

    Don Quixote Funster

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    I think it is a requirement of UK motorhomes that supply is removed whilst driving. Connect your camera to a feed from the vehicle battery that is live whilst driving and shut off when stopped.
     
  3. jollyrodger

    jollyrodger Funster Life Member

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  4. Old Soldier

    Old Soldier Funster

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    Thanks. I don't seem to have a constant live supply at the rear of the van. Surly they all liven up only when lights / Indicators etc are in use?
     
  5. Lofty1

    Lofty1 Funster

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    Alas there is not a live to the rear which is why I chose to use a wired system, also you can get a lot of interference on a wireless system
     
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  6. hilldweller

    hilldweller Funster Life Member

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    It is not a legal requirement, it's a daft idea dreamt up by the UK manufacturers association. It is laughed at by all continental manufacturers and their clients.

    It's very easy to fix once you know where the relay is.
     
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  7. Old Soldier

    Old Soldier Funster

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    Great! Give us a clue!! Under the bonnet or in the back of the van?
     
  8. hilldweller

    hilldweller Funster Life Member

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    I've no idea, I don't even know what van you have. I've got a German van, none of this nonsense.

    So what is your van, someone may know.
     
  9. rosalan

    rosalan Funster

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    That is why I did not understand the problem. I wonder if it isolates the electric toilet flush, now that could prove a real problem in my household when driving. Ooops! I didn't men to say that.
    Alan
     
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  10. Lofty1

    Lofty1 Funster

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    Just a thought your fridge has a 12v feed that can be reached through the vent if that make it easier
     
  11. Old Soldier

    Old Soldier Funster

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    Good point! 2000 Swift Gazelle on a Fiat Ducatto base. Anyone any ideas?
    Thanks to all for replies.
    Pete
     
  12. Old Soldier

    Old Soldier Funster

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    That's a possibility, thanks.
     
  13. Don Quixote

    Don Quixote Funster

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    Pete, perhaps make aand model of your MH would help a few on here that might have done this sort of thing to theirs.
     
  14. hilldweller

    hilldweller Funster Life Member

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    I'm sure it's been posted before try some searching if you don't get a reply. As far as I know it's only finding one wire to a relay and cutting it.
     
  15. Minxy Girl

    Minxy Girl Funster Life Member

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    We've considered wiring our rear camera into the rear lights before but it means having them on all the time which isn't ideal as they draw some of the power that the alternator is producing, rather than it going just to top up the batteries (although the power lost may be minimal). So instead for all our MHs/PVCs, as we had to run a cable for the camera to the front anyway, we just ran a 12v power cable alongside it then the feed for the camera and the monitor (we have one that goes over the existing rear-view mirror) were spliced together and a 12v plug put on the end which we just stick into the 12v socket in the cab - the advantage of this is that you never forget to turn the camera off as our cab sockets go off when the ignition is turned off, an alternative though would be to wire direct to the ignition but unless you know what you're doing leave the vehicle electrics alone.

    It means that if we want to move the camera and monitor to another camper (as we have 3 times now) it leaves no trace on the previous vehicle other than the 2 small holes where the camera was mounted (although cameras are so cheap nowadays it could be left on).
     
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  16. Old Soldier

    Old Soldier Funster

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    Thanks Brian. I did have a go at searching before my OP. Case of getting the wording right though. Will give it another go.
    Pete
     
  17. Flamenca

    Flamenca Funster Life Member

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    @Old Soldier I have a wireless camera system and I wired the camera/transmitter circuit to my rear side light circuit as it is also my preference to always drive with side lights on. I 'upgraded' my sidelights to LED bulbs so no major battery drain either.
     
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  18. Old Soldier

    Old Soldier Funster

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    That's not a bad idea Chris, I tend to run with side or dipped headlights most of the time.
    Cheers.
     
  19. chaser

    chaser Funster

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    I have got this , can't believe you have had it twelve years and only just found out, I found it first day out when i thought it had gone wrong, you only have to have the ignition on not the engine running, but is your battery near the rear of your van , if so why not just take a lead from that, we have some fag lighter plugs connected to ours so that we can charge things with the leisure battery while moving, fused of coarse before someone picks me up on it.
     
  20. chaser

    chaser Funster

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    Oh by the way there is supposed to be a wire that runs in the door post that you cut and it fixes it but I have never got round to finding it.
     
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