How many resistors for 3 pair of LED signals?

Discussion in 'The Garage' started by JustRon, Oct 3, 2012.

  1. JustRon

    JustRon ex-broadwayron

    Joined:
    May 8, 2011
    Oddometer:
    1,353
    Location:
    Brooklyn
    I know the LED turn signal thing has been beat to death, but I can't figure this out...
    On my 2010 Scrambler, I installed 3 sets of LED signals (they are small, so I figured 2 sets up front would be good). Here's the problem:

    With rear LED's and no resistors and incandescent signals up front, everything works as it should. (I can't stand the stock front signals, though.)

    In the front, I have 2 pair of LED's and resistors for the left and right side (I didn't think I needed 2 resistors for each side- do I?)... with this setup, ALL the signals blink at the same time! The front signals are wired together- a pair on the left side and a pair on the right side.

    If I remove the front left or right pair, all signals connected will blink.

    I don't think any wires are crossed- I think this is all due to impedance or resistance or something like that (sadly, I was a Physics major over 20 years ago- looks like that paid off).
    Do you think I need to add more resistors? I'm thinking this is the case, but wanted some opinions from folks around here, since there's so much knowledge floating around the garage.

    Edit: Further research says that I may have to replace my signal indicator bulb with an LED one (which is fine, because I already have one- uninstalled).
    #1
  2. Hootowl

    Hootowl Long timer

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    Jul 2, 2002
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    Bend Oregon
    #2
  3. JustRon

    JustRon ex-broadwayron

    Joined:
    May 8, 2011
    Oddometer:
    1,353
    Location:
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    Well, all I needed was to replace the incandescent signal indicator ("idiot light") with an LED version, and it all works.
    Just to clean things up, I ordered an LED Flasher Relay, because supposedly, you don't need resistors when you use one. I'd like to clean up the wiring (i.e., remove the resistors), but that may be a winter project.
    #3
  4. Dexter2811

    Dexter2811 Been here awhile

    Joined:
    Mar 13, 2012
    Oddometer:
    301
    Location:
    Buenos Aires, ARG.
    Check your wiring, if the dashboard indicator has one cable coming from each side of the bike (instead of "signal" and "ground") you should have to use a LED in that light.

    If it keeps blinking as there's a broken bulb you will have to use a 1 Ohm, 50W resistor paralel with each side of the bike.
    #4
  5. anonny

    anonny What could go wrong?

    Joined:
    Mar 20, 2007
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    5,772
    Location:
    Beautiful Revelstoke BC
    None, get a noload LED flasher.
    #5