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Old 10-03-2012, 07:20 PM   #1
JustRon OP
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Joined: May 2011
Location: Brooklyn
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How many resistors for 3 pair of LED signals?

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).
2010 Beta 520RR
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JustRon screwed with this post 10-04-2012 at 06:12 AM
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Old 10-04-2012, 05:41 PM   #2
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Try using this calculator
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Old 10-04-2012, 06:54 PM   #3
JustRon OP
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Location: Brooklyn
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To answer my own question...

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.
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Old 10-04-2012, 07:12 PM   #4
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Location: Buenos Aires, ARG.
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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.
2010 NX4 Falcon, 440cc Wiseco Big Bore, Stage II Hotcams, XR400R clutch, XR600 40mm Mikuni carb, MX handlebar (Wirtz), Custom exhaust.
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Old 10-05-2012, 10:02 AM   #5
What could go wrong?
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None, get a noload LED flasher.
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