12v adapter fitted to leisure battery

Discussion in 'Motorhome Accessories' started by Tom Lurk, Aug 2, 2016.

  1. Tom Lurk

    Tom Lurk Funster

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    I fitted a 12v fag lighter adapter to the leisure battery so we can charge stuff like phones (we hardly ever go to places with a hook up and the fag lighter in the dash runs off the van battery only). it is one of those ones meant for motorbikes and it has an on/off switch.

    since fitting a couple of days ago it has not been used, and neither has the LB, but now when i flick the switch to LB mode the red warning light comes on as soon as we turn a light on. can the new adapter be sucking the juice out of it even it is turned off? seems unlikely to me, but can't think why else it could be happening. its a brand new LB too!

    this is it:

     
  2. Muddibootz

    Muddibootz Funster

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    As I understand it, If it's a USB adapter, then it contains circuits to output 5v and will drain some power even if nothing is connected.
     
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  3. Tom Lurk

    Tom Lurk Funster

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    surely not enough to run a massive battery down in 24 hours?

    i am starting to think i may have borked something when i connected it.
     
  4. scotjimland

    scotjimland Funster Life Member

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    either that or a faulty USB adapter..

    the current draw when not in use is negligible.. certainly not enough to flatten a battery in 24hrs

    only way to check if it is drawing excess current is using a multimeter ..

    either that or you have another 12v drain you are not aware of
     
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  5. Tom Lurk

    Tom Lurk Funster

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    pretty sure we don't, as we have a switch where we can toggle between van battery and the LB, there is an 'off' position too which i was told isolates the LB.

    will disconnect and check terminals and see if that makes a difference. thanks for your advice :)
     
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  6. JJ

    JJ Funster

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    Did your battery show red after a couple of days before you fitted the thingy?

    Does it now... after you fitted it?

    I know where my suspicion lies.

    How about disconnecting it (after charging up the battery of course) and seeing if it returns to normal?


    JJ :cool:
     
  7. Tom Lurk

    Tom Lurk Funster

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    was fine when we last used it, and had 2 hour drive to re-charge. not used since (9 days ago). fitted adapter sunday evening, yesterday evening it went red as soon as light was switched on. no other use in between. i will disconnect before we head to the ferry tomorrow evening.
     
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