Using a voltmeter to find diagnose non-working indicators

Discussion in 'Australian Motorcycles' started by Mark, Dec 8, 2007.

  1. Mark

    Mark Guest

    Hi All,

    We'll I'm fixing my SR250 again. Its indicators don't come on at
    all. I've eliminated as suspects the fuse, globes, switch, and
    flasher relay, so unfortunately it's come down to a weekend and a
    voltmeter.

    I haven't used one of these things since school, and never on a
    vehicle. What I've done so far is turned the voltmeter to the
    continuity setting, checked that all the globe sockets are earthed
    (they are) and that the wiring loom sockets on the switch end are
    earthed (they are). The manual told me to check for 12V on a certain
    wire, but I'm wondering how to access this wire.

    So this is probably a stupid question, but, if I pull the two sides of
    the loom apart, and put a probe on the connector on each side, with
    the key turned to "on", should I expect to see 12V if everything is
    connected? Or would the fact that I've disconnected the loom mean I
    would only get 0 in this case because I"ve broken the circuit? In
    either case, what do I do next? The manual doesn't say what to if
    there's no 12v.

    Cheers,

    -- Mark
     
    Mark, Dec 8, 2007
    #1
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  2. Mark

    Warren Guest

    The manual told me to check for 12V on a certain
    Use a sewing pin push into wire (with loom connected) and ignition on you
    should have 12v at the pin with the negative lead of the multimeter to a
    good clean earth.

    Waz
     
    Warren, Dec 8, 2007
    #2
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  3. Mark

    Mark Guest

    Thanks - never thought of that! But in the end I was able to make
    contact from the wire-side of the loom. Found some weird things which
    I'm trying to diagnose at the moment. will update if I find the fix,
    for the benefit of future searchers of aus.motorcycles

    -- Mark
     
    Mark, Dec 8, 2007
    #3
  4. Mark

    Knobdoodle Guest

    How have you eliminated the switch and the relay? They'd be the ones I'd be
    looking very closely at before I started poking pins into the wiring.
    Do you have a wiring diagram in your manual? You should be able to bypass
    the flasher or the switches with a piece of wire (or one lead off your
    multimeter) to see what's open-circuit.
    It's usually near your headlight or in your switchblock.
    Where are you?
     
    Knobdoodle, Dec 8, 2007
    #4
  5. Mark

    Yeebers Guest

    I bet when he replies he's at a computer. :)
     
    Yeebers, Dec 8, 2007
    #5
  6. Mark

    Biggus..... Guest

    I take that bet.
     
    Biggus....., Dec 8, 2007
    #6
  7. Mark

    Moike Guest

    In my experience, "weird things" in otherwise simple electrics usually
    boils down to a bad earth somewhere.

    Moike
     
    Moike, Dec 9, 2007
    #7
  8. In "simple electrics" you get no problems , only misteaks
    it is in electronics like Moike says,where you foind that the "weird things"
    happen
    and more than loikely, it will be the earthing.
     
    George W. Frost, Dec 9, 2007
    #8
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