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switch with 2 outputs?


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carguy411 
Silver - Posts: 683
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Joined: April 02, 2002
Location: United States
Posted: June 22, 2012 at 6:00 PM / IP Logged  
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
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 22, 2012 at 8:32 PM / IP Logged  

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.

carguy411 
Silver - Posts: 683
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Joined: April 02, 2002
Location: United States
Posted: June 22, 2012 at 11:16 PM / IP Logged  
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
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 23, 2012 at 8:51 AM / IP Logged  
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.
carguy411 
Silver - Posts: 683
Silver spacespace
Joined: April 02, 2002
Location: United States
Posted: June 23, 2012 at 9:31 AM / IP Logged  
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
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 23, 2012 at 2:20 PM / IP Logged  
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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