2 horns through stock button
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=105109
Printed Date: May 21, 2024 at 6:57 PM
Topic: 2 horns through stock button
Posted By: Detour
Subject: 2 horns through stock button
Date Posted: May 29, 2008 at 7:10 PM
Ok, I'm hoping someone can help me out here. I'm going to be wiring up a 2nd horn. I want to switch between which horn is being heard. I want to use a normal on/off toggle as I want to use the steering wheel to control the horn still. How would I be able to wire up a relay to get this to work?
Hopefully thats easy to understand.
Replies:
Posted By: techman93
Date Posted: May 29, 2008 at 10:44 PM
What kind of horn are you going to use for your second horn?
The way you do it is find the horn trigger wire in the ignition harness and cut it. You then take a relay and wire as follows.
pin 86 to an ignition 12v
pin 85 to toggle switch
pin 87 to second horn trigger*
pin 87a to oem wire that was cut to horn side
pin 30 to the oem wire that was cut towards steering wheel side
second pin on toggle switch to ground
*depending on vehicle it will be dependent upon the oem trigger. Usually negative(-) but on some vehicles like VW it is positive(+)
That circuit will let you choose horn when vehicle is running that way you don't leave the relay on and drain your battery.
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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
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