Author Topic: Help with advanced sport touring add on brake light  (Read 1676 times)

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Offline firehawk618

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Help with advanced sport touring add on brake light
« on: May 03, 2014, 02:38:48 am »
I purchased the brake / turn signal light from these guys.

http://www.advancedsporttouring.com/Concours_LED_taillight_and_blinkers_p/c14-23.htm

When I was bench testing it I noticed that when you engage the turn signals the red running and or brake led stay on so it kind of washes out the orange look of the turn signal.

When I applied power to only the turn signal it was much brighter than when the running light / brake light was also lit.

My thought is this:  What if I were to wire it so when I turn on either blinker it cuts the red led to the side the blinker is engaged on?

It seems like it'd be electronically simple but I don't know what part I need.  I'm pretty sure there's some kind of simple transistor that would easily accomplish this but I do not know what to get.

Any ideas about this?

Thanks.
« Last Edit: May 03, 2014, 02:47:46 am by firehawk618 »
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Offline fartymarty

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Re: Help with advanced sport touring add on brake light
« Reply #1 on: May 03, 2014, 04:43:14 pm »
I purchased the brake / turn signal light from these guys.

http://www.advancedsporttouring.com/Concours_LED_taillight_and_blinkers_p/c14-23.htm

When I was bench testing it I noticed that when you engage the turn signals the red running and or brake led stay on so it kind of washes out the orange look of the turn signal.

When I applied power to only the turn signal it was much brighter than when the running light / brake light was also lit.

My thought is this:  What if I were to wire it so when I turn on either blinker it cuts the red led to the side the blinker is engaged on?

It seems like it'd be electronically simple but I don't know what part I need.  I'm pretty sure there's some kind of simple transistor that would easily accomplish this but I do not know what to get.

Any ideas about this?

Thanks.


First off, it sounds like something that AST should have designed into the unit itself like Admore does to their light bars. Perhaps they did, but yours isn't working correctly? I'd check with them first.  Their online video isn't that clear so I can't tell if it's doing what you say it does or if the red LEDs are turning off when the amber ones are energized.

Regardless, I can't help electronically, but electrically I might be able to assist.  Personally I think that with this device (I say this having never seen one except over the internet) I'm not sure that the running light operation adds all that much visibility with the unit being so thin vertically. I think that if the running light option is not used it would add more attention getting punch to the brake light when it's activated, but that's just my opinion and like I said I've never seen one in person.

So electrically you could accomplish this with 4 SPDT relays, or 2 DPDT relays, or without the running lights you would only need 2 SPDT relays.

Below I'm using the DPDT diagram from here: http://en.wikipedia.org/wiki/Relay

This is just for the lights on the right side since it would be the same for the other side except for the respective left side wires. Referencing the DPDT relay seen below, the ends of the coil are unmarked so just pretend that those are marked X and Y. The right side brake light input would go C1 and the output going to the AST unit right side brake light would attached at B1, the running light right side input would attach at C2 with the running light output  going to the AST unit right side running light would attach at B2. The X connection of the coil would be attached to the bikes ground (usually a Black wire with a Yellow stripe) and the Z connection of the coil would be attached to the right turn signal wire. This would interrupt the power to both the right side brake light and running light whenever the right side turn signal was energized. I'd bench test it first to see if it has the results you seek. I doubt the relays would need to be rated for more than 1 amp current.

<---this one

There are of course solid state relays which will perhaps do the job, but they have small amounts of leakage which I don't really understand if/how/or what that could effect on the bike so I've stayed away from them. I think most relays will outlast me so that's what I use.

Offline beegee

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Re: Help with advanced sport touring add on brake light
« Reply #2 on: May 03, 2014, 11:02:31 pm »
Nice  ;)
Great vids in THE link too !

Offline firehawk618

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Re: Help with advanced sport touring add on brake light
« Reply #3 on: May 11, 2014, 03:17:30 am »
Thanks for the great input.

I was going over this in my head.  Wouldn't a SPDT work fine for this?  I could wire the brake / tail into the portion that is normally closed and use my turn signal to energize the relay that would in turn open the brake light on the side as the blinker turns on?  I picture this as the simplest way to do it.
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Offline fartymarty

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Re: Help with advanced sport touring add on brake light
« Reply #4 on: May 11, 2014, 06:07:14 am »
Thanks for the great input.

I was going over this in my head.  Wouldn't a SPDT work fine for this?  I could wire the brake / tail into the portion that is normally closed and use my turn signal to energize the relay that would in turn open the brake light on the side as the blinker turns on?  I picture this as the simplest way to do it.

But like I said wouldn't you need two (one SPDT for each side) to do it, and wouldn't you then have to decide whether you wanted it to be a running light or a brake light? (I was assuming that you'd opt for a brake light in my earlier post)
I don't think you could have a brake light and a running light on each side unless you used a DPDT for each side (or 4 SPDT relays). I'd be interested to see a wiring diagram that would show how to do that (have brake and running lights on both sides) with only 2 SPDT relays.
So electrically you could accomplish this with 4 SPDT relays, or 2 DPDT relays, or without the running lights you would only need 2 SPDT relays.

Offline firehawk618

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Re: Help with advanced sport touring add on brake light
« Reply #5 on: May 17, 2014, 07:51:50 pm »
Thanks for the great input.

I was going over this in my head.  Wouldn't a SPDT work fine for this?  I could wire the brake / tail into the portion that is normally closed and use my turn signal to energize the relay that would in turn open the brake light on the side as the blinker turns on?  I picture this as the simplest way to do it.

But like I said wouldn't you need two (one SPDT for each side) to do it, and wouldn't you then have to decide whether you wanted it to be a running light or a brake light? (I was assuming that you'd opt for a brake light in my earlier post)
I don't think you could have a brake light and a running light on each side unless you used a DPDT for each side (or 4 SPDT relays). I'd be interested to see a wiring diagram that would show how to do that (have brake and running lights on both sides) with only 2 SPDT relays.
So electrically you could accomplish this with 4 SPDT relays, or 2 DPDT relays, or without the running lights you would only need 2 SPDT relays.

Oh I got where you were going with the DPDT relays now.  Actually when you add the new brake light it only has a single wire to the left and a single wire to the right to act as brake and running lights.  The kit includes a resistor which takes your stock parking light AND brake light and combines it to one output vs the stock setup with 2 wires.

Since this add on brake light has the ability to control the red on the left and the right by themselves all I did was wire each through it's own relay.  It's wired to the NC posts and I used the appropriate turn signal + to trigger the relay which opens the red on the appropriate side turning it off.

I got it done today and it works good.  The relays I used turned out to be noisy buggers but I'm sure I will not hear it once the bike is running.

Video will be added to this response once photo bucket digests it and gives me access to it. 

Ignore the 2 zip ties holding the light on.  I had issues with the 3m tape and need to get some.

Here's a video of it in action.  Sorry in advance as I was doing this by myself.

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