12v failure

ScreenName201C41223B
ScreenName201C41223B Forum Participant Posts: 5
edited April 2022 in Caravans #1

Can anyone help? I seem to have lost most of the 12v system in my 2007 Coachman pastiche 520. The water pump is working, as is the voltmeter on the control panel (reading 14v when connected to Ehu and 13.5 disconnected). The motor mover is also working fine. I have checked all the 12v fuses and they all seem to be intact. I'm totally confused. Am I missing something blatantly obvious. 1000 thank you's if you can point me in the right direction.

Simon Lockhart. 

Comments

  • commeyras
    commeyras Club Member Posts: 1,853
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    edited April 2022 #2

    Simon, try cleaning the contacts on the fuses (the two prong things on the fuse) with sand paper.  Odd that just a few things have stopped working.

  • Pippah45
    Pippah45 Forum Participant Posts: 2,452
    1000 Comments
    edited April 2022 #3

    I have thought mine lost when I hadn't switched on the lights on the control panel - but it sounds as though you may not have some other things?  Loo flush?  

  • commeyras
    commeyras Club Member Posts: 1,853
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    edited April 2022 #4

    Pippah could have hit the nail on the head.  In my caravan the light switch has to be 'on' for wc flush to work.  If this does not solve the problem please list which items are working and which not.  We'll get there don't worry.

  • ScreenName201C41223B
    ScreenName201C41223B Forum Participant Posts: 5
    edited April 2022 #5

    Items not working are ; lights, tv antenna, radio, roof fan, hob igniter and awning light. The only working items are the water pump and voltmeter. The motor mover also works but this is isolated from the 12v circuit when in operation. (The WC is manual flush so not an issue).

  • ColinHale
    ColinHale Club Member Posts: 10
    edited April 2022 #6

    Not familiar with the 12V electrics in a coachman. It sounds like there is a problem with one of the 12v feeds to the distribution/ fuse box or grouped returns to the battery. you will really need a test meter to diagnose properly. you could first check if any  thicker cables around the fuse box appear a bit lose. Occasionly a blade type fuse that appears intact can have gone open circuit, that has happened to me in the past. hope you are able to find the fault witout having to pull a lot of wireing about.

  • ColinHale
    ColinHale Club Member Posts: 10
    edited April 2022 #7

     It is possible there is more than one fuse box for the internal electrics as well as the road lights

  • ScreenName201C41223B
    ScreenName201C41223B Forum Participant Posts: 5
    edited April 2022 #8

    Thanks everyone for your help. Took Colin's advice and attacked the caravan with a multimeter. Turns out the PCB inside the fusebox is cooked. Unfortunately these boards are now obsolete but a replacement is available that can be adapted. It's been ordered so fingers crossed. 

  • PeteCI
    PeteCI Club Member Posts: 66
    edited April 2022 #9

     Hi Simon,

    Sorry to hear that your PCB is faulty, they're not cheap!

    I wonder if I could make a cheeky request to have your defunct pcb.

    I would like one to trace the internal circuit to help diagnose problems in the future. It doesn't need to be working.

    I'm happy to pay carriage costs and a bit towards your replacement.

    If it's possible, you can email me at petecoedial at a certain google owned domain and I'll exchange details.

    Pete

  • commeyras
    commeyras Club Member Posts: 1,853
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    edited April 2022 #10

    Glad you have been able to diagnose the problem.  Hope it is sorted.

  • ScreenName201C41223B
    ScreenName201C41223B Forum Participant Posts: 5
    edited June 2022 #11

    Do you still want my defunct pcb? Email your address to me at simon_lockhart@hotmail.com and I'll pop it in the post.

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