Identifying which battery...

Discussion in 'Tech/Mech General' started by oaktree11, Aug 27, 2015.

  1. oaktree11

    oaktree11 Funster

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    hi all,

    I have managed to think myself to a standstill! So, this might be a dumb one.
    The radio in my Ducato based Burstner is supposed to be powered from the leisure batteries.
    When I removed the old radio (certainly not the original) there is a whole mess of wires which have been discarded and a what I take to be a standard DIN plug spliced in.
    My question is, without disconnecting the starter or leisure batteries, how can I check which battery is feeding the live in the plug?
    Thanks
    John
     
  2. mjltigger

    mjltigger Funster

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    Continuity test from battery +ve to +ve connection on din plug

    But I would have thought disconnecting would be quicker and easier
     
  3. SomeoneElse

    SomeoneElse Funster

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    A sensitive volt meter? to check the slightly different voltages from the two batteries.
    Increase the voltage difference between the batteries, by connecting a charger to one of them.
     
  4. oaktree11

    oaktree11 Funster

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    Thanks guys. I agree that disconnecting one battery would be best. I will start with a continuity test. The starter battery is under the passenger footwell right below the radio.
    Appreciate the help
     
  5. Stealaway

    Stealaway Funster

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    I think you will find it is fed from the start battery, just fed by a permanent live, not through the ignition switch
     
  6. eddievanbitz

    eddievanbitz Trader - Funster

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    Pop the hazard lights on. One voltage will be stable one voltage will fluctuate

    Simples!
     
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  7. WynandJean

    WynandJean Funster

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    Now that's clever!

    Wyn


     
  8. oaktree11

    oaktree11 Funster

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    Normally I would agree but the Bustner book states several times that in Ducato based MH's the radio is fed from the Leisure batteries
    John
     
  9. oaktree11

    oaktree11 Funster

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    Now THAT is genius, thank you!
    In reality it doesnt really matter because when its off its OFF not on standby.
    John
     
  10. oaktree11

    oaktree11 Funster

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    And here is the finished article! I am quite pleased with it

    John IMG_1608[1].JPG
     
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  11. Drexxer

    Drexxer Funster

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    Now that's looks a damn site neater than the crappy Blaupunkt with no reception that currently adorns my van! (y)

    Andy
     
  12. oaktree11

    oaktree11 Funster

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    Andy, I am available on a free consultancy basis!
     
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  13. eddievanbitz

    eddievanbitz Trader - Funster

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    That means you'll loose all of you "saved" settings and radio favourites.

    The"standby" which is normally ignition controlled is best disconnected and a constant 12 volt supply connected to the standby with a small switch in series
     
  14. oaktree11

    oaktree11 Funster

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    By the way, the trick with the flashers works like a charm! Thanks again
     
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