alarm flash leds?

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93166
Printed Date: July 07, 2025 at 8:43 AM

Topic: alarm flash leds?

Posted By: carguy411
Subject: alarm flash leds?
Date Posted: April 20, 2007 at 12:58 PM

im doin an alarm in my friends bike.what i want to do is use the wire that connects to the turn signals that flashes when the alarm is armed and disarmed.
i wantto take that wire and split it so it flases turn signals and also flashes the led accent lighting pods. but still have them work independantly from each other. can i just use 2 diodes to isolate them from each other
thanks

Replies:

Posted By: the12volt
Date Posted: April 20, 2007 at 1:02 PM

You would be better off using relays instead of diodes, but yes, it is possible if the diodes are rated higher than the maximum current draw of the lights.

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Posted By: carguy411
Date Posted: April 20, 2007 at 1:05 PM

we;; a;; hte lights including the turn signals are leds so they dont draw to much

either way how would i do it
im notto sure ofthe ocnections
thanks

Posted By: the12volt
Date Posted: April 20, 2007 at 1:15 PM

With relays...

Relay 1
85 to ground
86 to positive light flash output from alarm
87a Not Used
30 to lights(1)
87 to 12V+

Relay 2
85 to ground
86 to positive light flash output from alarm
87a Not Used
30 to lights(2)
87 to 12V+

If you want to isolate each set of lights from the switch too

Relay 1
85 to ground
86 to positive light flash output from alarm
87a to switch side of lights (1)
30 to lights
87 to 12V+

Relay 2
85 to ground
86 to positive light flash output from alarm
87a to switch side of lights (2)
30 to lights
87 to 12V+

With diodes...

Positive light flash output from alarm to anode side of each diode.
Cathode side from one diode to lights(1)
Cathode side from other diode to lights(2)

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Posted By: the12volt
Date Posted: April 20, 2007 at 1:26 PM

BTW, the above assumes that all light leads are positive.

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Posted By: carguy411
Date Posted: April 20, 2007 at 1:35 PM

what way is better to do
relays or diodes?
thanks

Posted By: the12volt
Date Posted: April 20, 2007 at 1:38 PM

I would use relays in this case.

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Posted By: carguy411
Date Posted: April 20, 2007 at 1:52 PM

ok thanks so just to make sure if i do it like this when the engine leds are turned on it wont turn on the turn signals and viseversa
if the turn signals are engagedte engin leds will no flash or turn on if they are not wanted?
thank again

Posted By: the12volt
Date Posted: April 20, 2007 at 1:55 PM

Correct, the relays will isolate each set of lights from each other and each respective set of lights will only come on when you turn each on or when there is 12V+ coming from the alarm light flash output.

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Posted By: carguy411
Date Posted: April 20, 2007 at 2:04 PM

ok great thank you for all your help
im going to try it this week
thanks again

Posted By: the12volt
Date Posted: April 20, 2007 at 2:44 PM

You're welcome.

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Posted By: carguy411
Date Posted: April 24, 2007 at 7:25 AM

ok well i tried it the first way w/ the leds and it was working fine untill i noticed that the front light was slightly staying on until i started the bike i checked cinnects and its still doing it. then after a few min and disarming and rearming the alarm it wouldnt flash that side all together.what do you think it can be? thank you for your hel[

Posted By: dualsport
Date Posted: May 18, 2007 at 7:50 PM

When you say front light, do you mean the headlight? Is that one of the lights you connected your relay outputs to?

You'll probably need to describe how you hooked everything up.
If one side doesn't work and the other does, then you have to check the connection to that relay, since the same signal is being used for both sides. If all your connections check out, then maybe you have a failed relay, as unlikely as that seems.