horn honk?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=121979
Printed Date: July 13, 2025 at 11:20 PM

Topic: horn honk?

Posted By: 2muchfreetime
Subject: horn honk?
Date Posted: May 24, 2010 at 8:11 AM

I just purchased a 1990 mustang 7up convertable.I installed a autopage rs-915 LCD.All went fine except I want to use oem horn with siren.Manual says output wire is -200ma.The horn wire is - at steering colomn.My guess is I would need to use a relay.Can someone tell me correct way to wire relay if needed.

Replies:

Posted By: kreg357
Date Posted: May 24, 2010 at 8:29 AM

R/S (-) horn output to Relay pin 85.

+12v constant to relay pin 86. (Fused at 2 Amp)

Chassis ground to Relay pin 30.

Relay pin 87 to cars horn wire.

Relay pin 87a is not used and should be cut and insulated.

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Soldering is fun!

Posted By: 2muchfreetime
Date Posted: May 24, 2010 at 9:33 AM

Thanks very much for the info..I am so glad i found this site.I wish I knew about it years ago.

Posted By: t&t tech
Date Posted: May 24, 2010 at 2:16 PM

You won't need that relay! If you're going to the trigger wire at the steering!

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

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