the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

how many relays


Post ReplyPost New Topic
< Prev Topic Next Topic >
phununit 
Member - Posts: 4
Member spacespace
Joined: July 28, 2009
Location: Arizona, United States
Posted: August 05, 2009 at 11:10 AM / IP Logged  

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

racerjames76 
Silver - Posts: 581
Silver spacespace
Joined: November 22, 2008
Location: Ohio, United States
Posted: August 05, 2009 at 11:34 AM / IP Logged  
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.
phununit 
Member - Posts: 4
Member spacespace
Joined: July 28, 2009
Location: Arizona, United States
Posted: August 05, 2009 at 1:27 PM / IP Logged  

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?

racerjames76 
Silver - Posts: 581
Silver spacespace
Joined: November 22, 2008
Location: Ohio, United States
Posted: August 05, 2009 at 2:14 PM / IP Logged  
how many relays -- 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.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: August 05, 2009 at 2:36 PM / IP Logged  
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.
t&t tech 
Platinum - Posts: 2,594
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: August 05, 2009 at 6:15 PM / IP Logged  

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!

t&t tech 
Platinum - Posts: 2,594
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: August 05, 2009 at 6:46 PM / IP Logged  

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

i am an idiot 
Platinum - Posts: 13,597
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 05, 2009 at 6:51 PM / IP Logged  
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
t&t tech 
Platinum - Posts: 2,594
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: August 05, 2009 at 7:14 PM / IP Logged  
In his picture yes they are correct! but in his earlier description he has the polarities in reverse!
i am an idiot 
Platinum - Posts: 13,597
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 05, 2009 at 8:51 PM / IP Logged  
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
Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Wednesday, November 30, 2022 • Copyright © 1999-2022 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer