2004 Horn Honk from BW 4150
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=60004
Printed Date: July 14, 2025 at 1:58 PM
Topic: 2004 Horn Honk from BW 4150
Posted By: sandmanx
Subject: 2004 Horn Honk from BW 4150
Date Posted: July 24, 2005 at 8:47 PM
Do I need to use a relay for the (-) output from the brain to the (-) output to the horn wire coming from the steering colomn?
Replies:
Posted By: iskidoo
Date Posted: July 24, 2005 at 9:57 PM
Yes, that way you won't burn out the output on the brain.
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Steve G
Posted By: sandmanx
Date Posted: July 24, 2005 at 10:07 PM
I hooked it up on the alarm without a relay and it works fine....is this bad?
Posted By: iskidoo
Date Posted: July 24, 2005 at 10:17 PM
It depends on how much the output can handle. Sometimes a good solid ground is needed to trigger the horn wire depending on the vehicle. I did a few horn outputs when I started installing and had problems with the internal relay getting stuck and having the horn sound constantly. I had to unplug the brain just to shut it up and add a relay. after that it worked fine. I had another time when i tried wiring the horn output directly and fried the horn output. I always use a relay now just to be on the safe side and for reliabilty. I would recommend using the relay but I can't say that it is absolutely neccessary.
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Steve G
Posted By: Powermyster
Date Posted: July 25, 2005 at 5:51 AM
Use the relay. you'll be better off in the long run
Posted By: sandmanx
Date Posted: July 25, 2005 at 5:36 PM
Say the horn mysteriously stopped working today..blown output?
Posted By: iskidoo
Date Posted: July 25, 2005 at 11:15 PM
Quite possibly, test for a negative output when it should be sounding the horn.
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Steve G
Posted By: Powermyster
Date Posted: July 26, 2005 at 3:43 AM
IF by stroke of luck its not blown get a relay
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