train horns 05 f350

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=102028
Printed Date: July 01, 2025 at 4:46 PM

Topic: train horns 05 f350

Posted By: hzemall
Subject: train horns 05 f350
Date Posted: February 09, 2008 at 12:42 PM

Quick Question:
On this truck there are 4 aux switches on the dash, I want to be able to activate the train horns with one of these switches, how do I wire a relay for this

Thanks

-------------
Tim Baillie
Installer/Designer/Fabricator
Certified Autosound & Security

Replies:

Posted By: tedmond
Date Posted: February 10, 2008 at 7:33 AM

using your switch and relay wire up like so.

switch will send negative out to relay.

85 - ground from switched source
86 - constant 12v
87 - high current 12v
30 - to positive wire of horn.

ground the horn negative wire.

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