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Thread: Indicators like hazards any ideas?

  1. #1
    Join Date
    25.10.2016
    Location
    West Midlands
    Ducati models
    Monster
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    22

    Default Indicators like hazards any ideas?

    Good afternoon all.

    My monster has been undergoing a bit of restore for the past 6 months and I've hit a problem with the indicators. Now i am a spark by trade and no stranger to a multi meter but with the instrument panel plugged in my indicators act like hazards.

    With the instrument panel unplugged they act normally. I have fitted LED indicators with an electronic relay which all work fine until the panel is plugged in.

    Ive then disconnected all LEDs and with a multimeter checked the voltage at each point FL FR and RL and RR and they all have power on them with the instrument panel plugged in to I'm almost certain the fault lies with the panel, which did work until I removed it.

    The turn signal lamp is also ok.


  2. #2
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    MTS1200 ABS, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,187
    Which version of monster have you got? For the later models the indicators are driven directly from the dash. For earlier ones they are conventional but the flasher tell-tale light is wired across left and right so that when one side is lit the other side provides the earth, see here:

    With bulbs there isn't a problem because the small tell-tale lamp can't pass enough current to light up the indicator bulbs on the other side but LEDs need very little current to light up so you end up with the hazard light situation.
    There are two solutions.
    1. Use two LEDs back to back for tell tale lights.


    2. Use 2 diodes connected anode to anode with the warning lamp between the anodes and earth.


    LEDs all round.

    Old enough to know better, young enough not to care

  3. #3
    Join Date
    25.10.2016
    Location
    West Midlands
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    22
    Thanks Derek for the info. It's a 2001 750.

    They also work fine when the indicator lamp is removed. I have 1k load resistor fitted
    To all indicators.

    What do you think is the best bet?

  4. #4
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    MTS1200 ABS, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,187
    This is your dash wiring :


    If you add two 1N4002 diodes and connect the other wire from the warning lamp to earth as in this diagram it should work :

    Old enough to know better, young enough not to care

  5. #5
    Join Date
    25.10.2016
    Location
    West Midlands
    Ducati models
    Monster
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    22
    Derek your a star my friend.

    Collected a few diodes from maplins, drop of solder and bit heat shrink and job done.

    I don't know how I didn't work it out sooner!

    Thanks for your help.

  6. #6
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    MTS1200 ABS, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,187
    No problem. Happy to help

    Old enough to know better, young enough not to care

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