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Wiring 2 horns off switch


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Detour 
Member - Posts: 20
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Joined: September 21, 2004
Location: United States
Posted: November 10, 2005 at 3:22 AM / IP Logged  
I've got a 95 Chevy Caprice and I've got a Whelen Airhorn which I've connected onto a normal push button toggle. What I'd like to do is wire the Airhorn to the actual horn button from the steering wheel. ie Toggle -> horn is normal... Toggle <- horn is Airhorn. Would anyone be able to inform me on how to wire this up?
geepherder 
Platinum - Posts: 3,599
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: November 14, 2005 at 6:57 AM / IP Logged  

There's a black wire in your steering column that controls the horn.  When you push the horn button, this wire grounds, and your horn honks.  To test this wire, take a simple test light, and probe the wire.  Touch the other end to the rim on your cigarette lighter.  The horn should honk if this is the correct wire.  What you need to do is wire up a relay to use this black wire as your trigger.  You can wire everything inside the car (except the air horn, of course)- no need to go to the battery for power.

Your red wire at the ignition harness is your constant (verify with a meter).  Run a fuse holder from this wire to terminals 86 and 30 on the relay.  Connect terminal 85 to the black wire at the steering column that triggers your horn.  Now, run a wire from terminal 87 on your relay out to your air horns, and ground the other terminal to complete the circuit. 

If you want to be able to switch from your factory horn to the factory horn with the air horn, cut the wire that goes to terminal 85 on your relay, and put in a simple toggle switch.  When the switch is off, only your factory horn will sound.  When it's on, both the factory, and air horn will sound.

My ex once told me I have a perfect face for radio.
adrianspeeder 
Copper - Posts: 53
Copper spacespace
Joined: March 01, 2005
Location: United States
Posted: November 15, 2005 at 9:23 AM / IP Logged  
I did it with two relays like this
Wiring 2 horns off switch -- posted image.
Adrianspeeder
'02 F250 PSD, '97 F-150, '71 F-100, '66 F-250, '93, '92, '88, '84 Broncos
Penn State electrical engineerin' major
Detour 
Member - Posts: 20
Member spacespace
Joined: September 21, 2004
Location: United States
Posted: December 08, 2005 at 3:35 AM / IP Logged  
It's a Whelen brand Airhorn so I think it would sound like ass if both the normal horn and the airhorn blow at the same time.
Here's their diagram, but I'll be honest, I suck at reading wiring diagrams.
http://www.whelen.com/install/133/13326.pdf

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