12v strip light problem

Discussion in 'Tech/Mech General' started by Mags52, Feb 12, 2016.

  1. Mags52

    Mags52 Funster

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    Two adjoining strip lights in our van failed recently and eventually I decided to shell out and buy 2 x LED strip light bulbs. Went to fit them just now and discovered that the problem isn't the bulbs as fitting new ones made no difference. There must be an electrical fault. It's an autotrail with strip lights running along the tops of all the overhead cupboards and all the others work. I have absolutely no idea how to work out where the fault is. Would they all be on the same fuse? If so that can't be the problem. I so wish I'd discovered this before it was in the dealers for other warrant repairs in January. They're 140 miles away so going back isn't a practical solution.
    The new bulbs were £25 each so I'm keen to get the working!
    Mags
     
  2. Manic

    Manic Funster

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    Were the originals LED, if they were fluorescent tubes the LED's won't be a straight swap.
     
  3. Mags52

    Mags52 Funster

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    I checked with the seller and he said they were designed for straight swap into the original fluorescent fittings. Is that wrong?
     
  4. Mags52

    Mags52 Funster

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    Here's the copy of the email with the company:


    ----- Original Message -----
    I am interested in your replacement 12v strip light bulb T513.
    I want to replaced old flourescent bulbs in our motorhome with LED. The
    current ones are 8W. Can I put these LED bulbs in directly into the same
    holders and will they give similar or stronger light?
    Thanks for your help


    Hi Margaret, Yes they are designed as a straight replacement so use the existing fittings. Generally they give a better light than conventional tubes. Regards Andy
     
  5. Manic

    Manic Funster

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    I thought they had to be wired differently, to bypass the choke assembly but I could be wrong, I'm sure somebody will be along soon who knows more.
     
  6. Stealaway

    Stealaway Funster

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    Is there voltage at the light fitting?
     
  7. Welsh girl

    Welsh girl Funster Life Member

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    We've just had ours fixed by a Spanish fella here in Cartagena, he tested the battery first and that was ok at 13v but the contacts on the lights were showing only 7.5 volts.
    We changed to led from fluorescent tubes and I had to send the light fitment for him to change the on off switch too.
     
  8. JeanLuc

    JeanLuc Funster

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    The 8 watt fluorescent tubes normally fitted in a motorhome are designed for 230V AC (i.e. mains supply). The light fitting contains an inverter circuit to change the 12V DC supply into 230V AC. This has to be bypassed if fitting LEDs as the 'mains' equivalent supply will cook them. I assume your motorhome will have the 'normal' installation.
     
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  9. Manic

    Manic Funster

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    That was my thoughts.
     
  10. irnbru

    irnbru Funster Life Member

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    Mags send the bulbs back. I did all ours, Alan showed me then supervised. A roll of 5 metres at the car boot in Glasgow is £5 and tge connections £1 each. I can show you how to fit them or if you bring the MH over I have a little spare we can try.
     
  11. Mags52

    Mags52 Funster

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    Ours work on 12v not mains which is why we wanted to change to LED to save the batteries.
    Or am I misunderstanding?
    M
     
  12. Mags52

    Mags52 Funster

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    Thanks so much Sandra. Did you find the light bright enough when you used the strips?
     
  13. irnbru

    irnbru Funster Life Member

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    Yes. We have a bit of both leftover so you can see both whites.
    I did double it up over the cooker and sink just to make it extra bright for mum cooking and doing dishes.

    I stuck ours onto the existing bulbs and changed the connections but I noticed when we took the AT tour 2 weeks ago they were using LED rolls and not bulbs.
     
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  14. JeanLuc

    JeanLuc Funster

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    I'm afraid so. This is nothing to do with being on mains hook-up. The tubes work from the 12v system but inside the fitting there is an inverter circuit that changes this to 230v AC. This circuit needs to be bypassed if fitting LEDs which require 12v DC.
     
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