circuit to make running lights also function as signals? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 32 Old 06-10-2010, 10:43 PM Thread Starter
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Question circuit to make running lights also function as signals?

I have some LED lights on my forks as running/conspicuity lights (https://www.stromtrooper.com/showthread.php?t=41386). I'm about to switch to flushmount signals in front, and I want to make those always-on running lights also function as turn signals, since the flushmounts are hard to see from the front. So I'm trying to figure out a way to interrupt the steady-on state for each light when the signal on that side is turned on.

I thought of putting a normally-closed relay in line with each light, triggered by the flasher. But that means two little clicky relays in the fairing, which seems less than ideal. There must be a better way to do it, right? Any of you EE types have suggestions? TIA.

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Last edited by The Golden Monkey; 06-11-2010 at 02:00 PM.
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post #2 of 32 Old 06-11-2010, 08:05 AM
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Could you just wire them directly to the turn signal (in parallel)?

Don't have any up front but thats the way my LED turn signals are wired in the rear.

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post #3 of 32 Old 06-11-2010, 08:30 AM
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Originally Posted by Mud Puddle View Post
Could you just wire them directly to the turn signal (in parallel)?

Don't have any up front but thats the way my LED turn signals are wired in the rear.
Won't work. When the running lights are on (all the time when the ignition is on) the filament of the lamp has a completed circuit all the time. When the turn signal is on there is nothing to BREAK the circuit of the running light so it won't turn off. Effectively what you have to do is reverse the logic of the turn signal. Rather than making a circuit to turn the lamp on it has to break the circuit to turn the lamp off.

The easiest way is to use a lamp with two filaments, one for the running lights and one for the turn signals. That's typically how brake & tail lights work.

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post #4 of 32 Old 06-11-2010, 02:02 PM Thread Starter
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The easiest way is to use a lamp with two filaments, one for the running lights and one for the turn signals. That's typically how brake & tail lights work.
Yes, but they're LEDs, and not even bulb-type LEDs.

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I think we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem." - R. Buckminster Fuller
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post #5 of 32 Old 06-12-2010, 05:21 PM Thread Starter
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Bumpity. I know there are members here with more electrical knowledge than me.

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"I am enthusiastic over humanity's extraordinary and sometimes very timely ingenuities. If you are in a shipwreck and all the boats are gone, a piano top buoyant enough to keep you afloat that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top.
I think we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem." - R. Buckminster Fuller
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post #6 of 32 Old 06-12-2010, 11:44 PM
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Google "motorcycle turn signal relay" and go there -- looks like lots of choices. I'd do it but I have to go to bed now -- joining volunteers searching for flash flood victims tomorrow shortly after dawn.

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post #7 of 32 Old 06-13-2010, 12:34 AM
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Bumpity. I know there are members here with more electrical knowledge than me.
You could use 'magic blinkers' from:
http://www.customdynamics.com/magic_blinkers.htm

But these will make your running lights blink opposite of your turn signal, i.e. for every on pulse to your turn signal these will result in an off pulse for your running lights. I tried them and found it annoying that they were not blinking in sync. Same general idea as your relays.

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post #8 of 32 Old 06-13-2010, 12:43 AM Thread Starter
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Originally Posted by dancer
Google "motorcycle turn signal relay" and go there -- looks like lots of choices.
I already have an LED-compatible turn signal relay installed.
I think I'm not making myself clear. The issue is, the running lights need to be on except when the signal is on -- it's backwards from a normal turn signal circuit.

Ideally, each running light would have two hot wires running to it: one steady on, and one shared with the turn signal on that side. Only one of these circuits would be complete at any given time. Normal operation would be the steady power. When the signal is turned on, something (this is what I'm trying to figure out) would switch the running light's power source from the steady hot to the turn signal hot -- an electronically activated A/B switch. Am I making sense? It seems like it would be simple if one just knew what kind of switch/relay/widget to use.

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2009 DL650A - sold

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"I am enthusiastic over humanity's extraordinary and sometimes very timely ingenuities. If you are in a shipwreck and all the boats are gone, a piano top buoyant enough to keep you afloat that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top.
I think we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem." - R. Buckminster Fuller

Last edited by The Golden Monkey; 06-13-2010 at 12:46 AM.
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post #9 of 32 Old 06-13-2010, 12:45 AM Thread Starter
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Quote:
Originally Posted by Arne View Post
You could use 'magic blinkers' from:
http://www.customdynamics.com/magic_blinkers.htm

But these will make your running lights blink opposite of your turn signal, i.e. for every on pulse to your turn signal these will result in an off pulse for your running lights. I tried them and found it annoying that they were not blinking in sync. Same general idea as your relays.
Right. I'd like to avoid that reverse-blinky if possible.

2010 Triumph Tiger 1050se
2009 DL650A - sold

2005 DL650 - dearly departed
"I am enthusiastic over humanity's extraordinary and sometimes very timely ingenuities. If you are in a shipwreck and all the boats are gone, a piano top buoyant enough to keep you afloat that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top.
I think we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem." - R. Buckminster Fuller
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post #10 of 32 Old 06-13-2010, 03:03 AM
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There is a way to do it I suppose. When I was working on my bike one day I had the misfortune of breaking the ridiculously over engineered turn signal switch.


I replaced it with a SPDT switch, works like a charm, far more robust and a hell of a lot cheaper to replace.



What you want to do can maybe be done by replacing the turn signal switch with a similar TPDT switch.

Edit: The SPDT switch is of the on-off-on variety, and for both lights I think would need a triple pole double throw switch, I need to figure out how exactly that needs to be wired.....

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Last edited by Arne; 06-13-2010 at 03:37 AM. Reason: additional info
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