Train Horn Relay
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=93591
Printed Date: May 18, 2024 at 5:21 PM
Topic: Train Horn Relay
Posted By: siuhortguy
Subject: Train Horn Relay
Date Posted: May 03, 2007 at 5:12 PM
I'm installing a train horn in my truck and trying to figure out how to wire a relay for it. What I'd like to do is be able to operate it using my stock horn button, but would also like to be able to use my stock horn when needed. I know I need to use a relay to be able to do this, and this is what I was thinking:
30-solenoid valve for train horn
86-horn button
87-12v constant
85-toggle switch
Any problems with wiring it this way? I believe the horn button when activated will be my ground. Seems like this would be a simple and easy way to wire it, but I may be totally wrong so somebody please enlighten me. Thanks for your help.
Replies:
Posted By: hotwaterwizard
Date Posted: May 03, 2007 at 9:18 PM
What about your regular horn? You show no wiring for it in the post. Do you want a switch to swap horns? ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: siuhortguy
Date Posted: May 03, 2007 at 10:24 PM
Yes, that's what I'm using the relay as, a switch so I can switch between my regular horn and train horn. My hope was that by using the toggle switch, when it's off the relay will not be active so my regular horn will function as normal. However, when the toggle switch is on the relay will be active, so when I push the horn button it will sound the train horn instead of the regular horn. Will wiring the relay like I showed make it work like that? If not, how should I wire it? Thank you for helping out.
Posted By: hotwaterwizard
Date Posted: May 03, 2007 at 10:41 PM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: siuhortguy
Date Posted: May 03, 2007 at 11:55 PM
I don't understand why I need 2 relays, it's just the factory horn, I don't see why it wouldn't work just the same if the relay isn't active/armed. The toggle switch is an on/off switch, not to toggle between the two horns. I'm not going to attempt to draw one of those diagrams at the risk of being called a 3rd grader, but I will tell you in words what wires I know I need on the relay: 1 wire to the electric solenoid valve on the train horn 1 wire to 12v constant 1 wire to the stock horn button 1 wire to the on/off switch What I can't figure out is what terminals on the relay the wires are supposed to go to, I know those numbers mean something but it isn't obvious. Sorry I'm such a putz, and thanks for tryin to help out.
Posted By: iblis
Date Posted: May 04, 2007 at 4:24 AM
I had a similar query. You can look at the thread here: https://www.the12volt.com/installbay/forum_posts.asp?tid=93159&PN=1
If you press the horn pad and the switch is closed both horns go off. If the switch is open, only the stock horn goes off.
If that's what you are going for the diagrams should be of some help.
Posted By: KPierson
Date Posted: May 04, 2007 at 5:51 AM
The 2nd relay will make the OEM horn not sound when the aftermarket horn does sound. I'm guessing that the 'train' horn will be loud enough that you won't be able to hear the OEM horn, so I don't think it's really necesarry. You could also acomplish the same thing, but with only one relay by wiring the OEM horn output to pin 87A of a SPDT Bosch relay. ------------- Kevin Pierson
Posted By: hotwaterwizard
Date Posted: May 04, 2007 at 8:22 AM
You need 2 relays because the horn needs a positive and the horn switch gives a negitive. I could add another relay instead of the SPDT switch. ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: May 04, 2007 at 8:47 AM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
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