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switch with 2 outputs?

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=131677
Printed Date: October 31, 2024 at 6:37 PM


Topic: switch with 2 outputs?

Posted By: carguy411
Subject: switch with 2 outputs?
Date Posted: June 22, 2012 at 6:00 PM

heres what im trying to achive
im doing a light and siren package on a car(before i get yelled out we have the authorization from the city)

i want to addd the horn cycle function on the siren which uses the horn to change siren tones
usually i just disconect the factory horn and and be done with it...
but this is going to be dual purpose
so i want to have the hron function normally then when the lights are activated have that + output activate a relay switching from the neg pulse on horn to a neg pulse to the siren itself. without honking the factory horn
thanks




Replies:

Posted By: i am an idiot
Date Posted: June 22, 2012 at 8:32 PM

12 Volt positive from light supply also goes to terminal 86 of a relay.  Ground terminal 85 of that same relay.  Cut the positive wire that goes to the horn.  Connect the car end of that wire to terminal  30, Horn end of that wire to terminal 87A.  87 will give you a positive pulse when lights are on and you press the horn switch.





Posted By: carguy411
Date Posted: June 22, 2012 at 11:16 PM
i should of mentioned that factory horn a neg line,,,
does it matter?
sooo
it will keep factory horn working normal until lights are active then factory horn wont beep but it will still give me a neg pulse for the siren everytime horn button is pushed
thanks




Posted By: i am an idiot
Date Posted: June 23, 2012 at 8:51 AM
The actual wire going to the horn itself is positive in nature.

The way I described it, there will be a positive pulse, you will have to use a second relay to get negative out. Give me a minute and I can modify the instructions for negative trigger and negative out.




Posted By: carguy411
Date Posted: June 23, 2012 at 9:31 AM
oh ok because when i looked up the wire codes it says that the horn wire is negative , so i assumed it was a neg pulse ..i hope im making sense of what i want to do i dont want to confuse you
thanks




Posted By: i am an idiot
Date Posted: June 23, 2012 at 2:20 PM
The low current section of the horn wire (Between the Horn button and the relay) is negative in nature. The wire from the relay to the actual horn is positive. The horn is grounded to the chassis, there is probably only one wire leading to it.





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