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Old 02-02-2014, 10:35 AM   #1
markgsnw OP
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Whelen TIR 3: isolate from LED taillights?

Years ago I added a Whelen TIR3 to my GS, loved the thing. Recently decided to add one to the Norge, bracket is done and most of the wiring. What I think I'm learning from my voltmeter is the the brake light circuit is being fed a constant 7 volts, and gets fed 13 volts when the brakes are on. Poking around here, that appears to be the case with other bikes with LED tail/brake lights. I don't want the TIR3 to be on all of the time, only when I'm braking, so...



I'm wondering if I can use a 12 volt relay to isolate the LED brake lights from the TIR3's. If I'm reading the specs correctly for a Bosch relay, the pull-in voltage is 8 volts, and the drop out voltage is 1.2-5 volts, which in this case wouldn't do anything for me.



My electronics engineering experience is so far in the past that I've forgotten much of it. Can any of you electrical/electronics whizzes think of a way to isolate the TIR3 so that the TIR3 is only on when the brakes are applied?
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markgsnw screwed with this post 02-02-2014 at 10:57 AM
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Old 02-02-2014, 05:10 PM   #2
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I'm thinking I can use a diode in the relay power circuit. I'll read up and report back.
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Old 02-02-2014, 05:37 PM   #3
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Sounds like you might have a Canbus electrical system. If it is, one of the BMW guys might be able to advise you.
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Old 02-02-2014, 05:40 PM   #4
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Not a canbus
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Old 02-02-2014, 06:21 PM   #5
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Not a canbus
You sure? http://wildguzzi.com/forum/index.php...;topic=23322.0
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Old 02-02-2014, 11:16 PM   #6
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Not a canbus, but that link is solid gold. Blocking diode is what I had in mind and it is mentioned there as well. Thanks!
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Old 02-03-2014, 03:18 PM   #7
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Im putting a whelen on my bike as well this winter- any install pics? How much do people complain when you lead group rides?
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Old 02-03-2014, 09:00 PM   #8
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Seems odd that one wire is feeding two signals to your light.
Example, my Honda has a three wire system for brake, tail and ground.

Are you sure that you are checking the correct wiring... and such?
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Old 02-03-2014, 10:20 PM   #9
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Seems odd that one wire is feeding two signals to your light.
Example, my Honda has a three wire system for brake, tail and ground.
Having a single emitter (array) perform two functions by varying the voltage or pulse width is becoming more common.
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Old 02-04-2014, 09:32 PM   #10
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I guess I'm getting old...
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Old 02-06-2014, 11:56 AM   #11
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QUOTE=troidus;23385656]Having a single emitter (array) perform two functions by varying the voltage or pulse width is becoming more common.[/QUOTE]

Dang. That makes adding a brake flasher so much more complicated than it used to be. I'm interested to hear what you come up with as a solution. The relay seems like a good idea.
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Old 02-07-2014, 12:35 PM   #12
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I think the simplest thing would probably to also wire the TIR 3's would be to wire them in with the switch. However, at the back end I have an idea of a mechanism and could probably come up with the numbers you need.

You have your brake lights as is right now, and in parallel run a high resistance circuit to trip a solenoid. You can splice this back inline and run another pair of parallel circuits with your regular brake light on one and the TIR 3 on another line passing through the solenoid.
If you get the resistance right, the solenoid will only open and illuminate the TIR 3's when you have the full voltage applied.

If you want I can draw it out and calculate what numbers/parts you need.

Edit: This is assuming that you only have one hot line and one ground running to the taillight.
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Old 02-08-2014, 08:41 AM   #13
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My recollection is that parallel circuits have the same voltage. Kirchhoff's Law.
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Old 02-08-2014, 11:44 AM   #14
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Im putting a whelen on my bike as well this winter- any install pics? How much do people complain when you lead group rides?
Whelen LIN3 wired in parallel with my DL1000's brake filament - no high-tech CANBUS stuff goin' on in Suzuki-land.



The Whelen LIN/TIR light heads are EXTREMELY bright and irritating so I wired mine w/ a QD plug under the seat so that I can kill it for group rides. Oh, to add to the irritation quotient mine is wired through a Comagination brake light modulator so that it flashes a few times before it stays full on. (He he he he.)
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Old 02-08-2014, 11:56 AM   #15
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My recollection is that parallel circuits have the same voltage. Kirchhoff's Law.
Well, yes, but the line with the resistor in it would not allow enough current to flow to open the solenoid until the high voltage brake light came on. Ohm's Law.
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