Print Page | Close Window

how many relays

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=115474
Printed Date: March 28, 2024 at 3:34 AM


Topic: how many relays

Posted By: phununit
Subject: how many relays
Date Posted: August 05, 2009 at 11:10 AM

Would i need to connect 2 more sirens and a strobe light to my compustar alarm? Do I tap into the siren output wire?

Thanks




Replies:

Posted By: racerjames76
Date Posted: August 05, 2009 at 11:34 AM
Would be best using 3 relays, assuming your output is positive you would hook that to pin 85 of all 3 relays. connect all 3 pin 86's to ground. Hook all 3 pin 87's to 12v fused at 15-20 amps battery power, then run each pin 30 to the individual sirens, grounding each siren near where it is mounted. Hope that helps. if adding strobes add a 4th relay to turn them on as well. May want to run a separate fused 12v for the lights on pin 87 of that relay however.




Posted By: phununit
Date Posted: August 05, 2009 at 1:27 PM

racerjames76 wrote:

Would be best using 3 relays, assuming your output is positive you would hook that to pin 85 of all 3 relays. connect all 3 pin 86's to ground. Hook all 3 pin 87's to 12v fused at 15-20 amps battery power, then run each pin 30 to the individual sirens, grounding each siren near where it is mounted. Hope that helps. if adding strobes add a 4th relay to turn them on as well. May want to run a separate fused 12v for the lights on pin 87 of that relay however.

Hey racerjames any way you might be able to draw a simple diagram?





Posted By: racerjames76
Date Posted: August 05, 2009 at 2:14 PM
posted_image

excuse the crudeness...my diagram software expired

basically that will give you independent outputs safely without overloading the alarm wiring. make sure the siren relays are all matching so you dont get multiple chirps at different times while arming and disarming. Obviously you can use whatever color wires you have available.




Posted By: howie ll
Date Posted: August 05, 2009 at 2:36 PM
You can eliminate the first relay, not needed, go straight to existing siren,  just join the other three relay feeds to it. Second turn the 86 and 85  connections round, the convention is to make 86 the pos and 85 the neg sides of the coil. You will get into trouble if you ever have to read or work your way through a manufacturer's diagramme.




Posted By: t&t tech
Date Posted: August 05, 2009 at 6:15 PM

Why four relays? Two relays would be more than sufficient to do this job! Heck One could do the job as you don't have to worry about the strobes illuminating constantly, as the flasher would be buiilt in to the unit that came with the lights!

Mr phununit! you can use just one relay for the sirens and fuse it at around 15amps nothing more! sirens don't draw that much current that they would require three separate relays! wire your single relay just as mentioned above!  If you want the strobes to blink along with the siren you can also use this same relay to feed the strobes!

And as howard said reverse the polarity of the coils!





Posted By: t&t tech
Date Posted: August 05, 2009 at 6:46 PM

Also not to mention the effect that four energized relays would have on the battery, assuming the alarm triggered while you were away!





Posted By: i am an idiot
Date Posted: August 05, 2009 at 6:51 PM
85 and 86 are correct in his picture.   A single relay would more than do the job in this application.  They are rated at 40 amps.  He may be looking at 2 amps per siren. 

-------------
Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB




Posted By: t&t tech
Date Posted: August 05, 2009 at 7:14 PM
In his picture yes they are correct! but in his earlier description he has the polarities in reverse!




Posted By: i am an idiot
Date Posted: August 05, 2009 at 8:51 PM
They aways told me I should read too and not just look at the pictures. 

-------------
Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB




Posted By: t&t tech
Date Posted: August 06, 2009 at 5:04 PM
LOL! posted_image, what happened to the crystal ball signature?




Posted By: i am an idiot
Date Posted: August 06, 2009 at 7:36 PM

You must have missed that few hours of excitement   I was enlightened on a few things by a guy named Junior.   I learned that I am not a Master Installer, and also learned that I ain't no troubleshooter. 



-------------
Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB




Posted By: mikvot
Date Posted: August 06, 2009 at 8:26 PM

So, what you are telling me, is that Junior stole your crystal ball, and he is now using that said crystal ball to tell you what kind of installer you are. Awesome! Lol..... I'm next Junior, tell me what kind of installer I am!





Posted By: i am an idiot
Date Posted: August 06, 2009 at 8:41 PM
He did not steal the crystal ball.  He was going to try, but it was working well that day and alerted me to the upcoming theft.

-------------
Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB





Print Page | Close Window