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Discussion Starter #1
Okay I even got the pre-wired kit, and can't figure what's wrong!
Horn comes on as soon as I turn the key.

I just wired the fused pos red and neg ground to the battery,
and the blue to the brown/black wire that went to the old horn.

The relay is setup with the blue to the 86 connector on the bottom,
87 connector on the left goes to pos of battery,
30 connector on right goes to pos of new horn,
and 85 connector on top goes to neg of battery and neg of new horn.

Anyone know what's wrong?
 

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Discussion Starter #3
I tried switching the blue from old horn wire to 85
and the neg to 86. same thing. i'm really baffled.
 

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The Gadget site reference above shows different hook up of the relay...

30 is fused 12V + incoming from battery
85 is the ground
86 is from the horn button lead
87 becomes hot 12 V+ out to the Stebel

Other than that, possibly your 'blue wire' gets 12 volts on it when you start the engine...and that pulls in the relay.

check the voltage on the blue wire while running?

If it is 12 volts, then it is not the correct wire from the horn button.... and you will need to find that.

??

Annie



Okay I even got the pre-wired kit, and can't figure what's wrong!
Horn comes on as soon as I turn the key.

I just wired the fused pos red and neg ground to the battery,
and the blue to the brown/black wire that went to the old horn.

The relay is setup with the blue to the 86 connector on the bottom,
87 connector on the left goes to pos of battery,
30 connector on right goes to pos of new horn,
and 85 connector on top goes to neg of battery and neg of new horn.

Anyone know what's wrong?
 

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Discussion Starter #5
Well I've tried a dozen times. Just as described.
Even tried the other relay that came with the wiring. Same thing. And my ears hurt :)

I can't find my circuit tester, but there's only the brown/black and black/white connected to the old horn. The black/white must be ground.

I just don't understand why it's doing it. The brown/black must be supplying voltage to open the relay circuit when the ignition is on. When it's removed from the relay, there's nothing. When connected to the old horn, it only sounds when the horn is pressed. I just don't get it.

Thanks all for your suggestions, though.
 

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confirmed
85: ground (to frame or battery)
86: low current input (hot wire from oem/bike horn)
87: power output (hot to stebel horn)
30: +12V input from battery

also, found this posting by Jeep Pirate

Your existing horn wires go on terminals 85 & 86. It does not matter which order. Your positive wire from battery (with in-line fuse) goes to terminal 30. The wire to the air horn goes on 87. Then just ground the other air horn wire.
 

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you need a voltmeter...
one of those two wires will go hot if the engine is running and the horn button is pushed. That is the one you want to hook to the relay base 86.

good luck





I can't find my circuit tester, but there's only the brown/black and black/white connected to the old horn. The black/white must be ground.

I just don't understand why it's doing it. The brown/black must be supplying voltage to open the relay circuit when the ignition is on. When it's removed from the relay, there's nothing. When connected to the old horn, it only sounds when the horn is pressed. I just don't get it.

Thanks all for your suggestions, though.
 

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Discussion Starter #8
The brown/black to old horn is hot at 12v when ingition is on, testing with frame ground.
When it's hooked up and tested with the ground of the old horn it's live only when the horn is pressed.
 

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Not an electrician by any means, but have you considered a bad relay, i work on computers all the time and have seen lots of new components dead or malfunction right out of the box, and they are much pricey-er,(is that a word)?

Just sayn. If I am out of line or offline please feel free to ignore, i do that a lot.:eek:
 

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Discussion Starter #10
I have a grounding horn button system.
I had to run the blue from the ground of the old horn to 86.
I used a coil power adapter from the fused 12v to both 85 and 87.
The ground from new horn and battery are discarded.

Is my bike different from all the others? Is it a problem somewhere?
2 days old and not news I want to start with.
 

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this is probably my misunderstanding too.
But if you can do the following it should work..


---I cant follow your color descriptions...but the horn button controls a wire that goes hot only when the button is pushed. Find that wire and land it on 86
--- Land the 12+ v fused source from battery on 30
---Then provide a new ground from 85 to the frame or the neg terminal. Direct.
--- Take a wire from terminal 87 directly to the Stebel hot lead.
--- Take the Stebel ground lead to the frame somewhere or the neg terminal.

Then when you push the horn button... 86 energizes the coil to pull in. That causes 30 to connect to 87...which powers the horn..thru to ground.

your bike shouldnt be different...
 

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Discussion Starter #12
this is probably my misunderstanding too.
But if you can do the following it should work..


---I cant follow your color descriptions...but the horn button controls a wire that goes hot only when the button is pushed. Find that wire and land it on 86
--- Land the 12+ v fused source from battery on 30
---Then provide a new ground from 85 to the frame or the neg terminal. Direct.
--- Take a wire from terminal 87 directly to the Stebel hot lead.
--- Take the Stebel ground lead to the frame somewhere or the neg terminal.

Then when you push the horn button... 86 energizes the coil to pull in. That causes 30 to connect to 87...which powers the horn..thru to ground.

your bike shouldnt be different...
The brown/black horn wire goes hot with the horn button only when it's using the other horn wire for ground.

When it's used with the the battery or frame ground, it's always hot.

Still trying to figure out what's making it different or if it's a problem.
 

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Something wrong if it is always hot as you say. That will keep the horn on. Find the right wire like I said?
The brown/black horn wire goes hot with the horn button only when it's using the other horn wire for ground.

When it's used with the the battery or frame ground, it's always hot.

Still trying to figure out what's making it different or if it's a problem.
 

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I have a grounding horn button system.
I had to run the blue from the ground of the old horn to 86.
I used a coil power adapter from the fused 12v to both 85 and 87.
The ground from new horn and battery are discarded.

Is my bike different from all the others? Is it a problem somewhere?
2 days old and not news I want to start with.
From the Vulcan 900 maintenance manual wiring diagram, the horn is a "switched ground" activated device. The Brown/Black wire goes straight to the fuse panel (+12V). The Black/White wire goes to the horn button on the left handlebar grip. The other side of the horn button switch connects to a Black/Yellow wire which connects to frame ground. So, when the horn button is pressed, the connection to ground is made and the horn sounds.

Sounds to me like your bike is wired just like the book says.
 

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Discussion Starter #15
From the Vulcan 900 maintenance manual wiring diagram, the horn is a "switched ground" activated device. The Brown/Black wire goes straight to the fuse panel (+12V). The Black/White wire goes to the horn button on the left handlebar grip. The other side of the horn button switch connects to a Black/Yellow wire which connects to frame ground. So, when the horn button is pressed, the connection to ground is made and the horn sounds.

Sounds to me like your bike is wired just like the book says.
Excellent! Thanks Steve.
 

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wiring diagram wins

The guy with the wiring diagram for the bike beats the armchair (non)electricians. Who would'a thunk it! Glad that it's sorted out.
 

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Hey Fellas
Why didn't you just buy the wiring harness already made up for the horn. Its $20 at Bikers Highway and then you don't have to dick around with all the wiring BS, its plug-and -play. For guys like me I need something STUPID PROOF!!
 

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been there - done that

You'd think so! But see the first post in this thread

"Okay I even got the pre-wired kit, and can't figure what's wrong!
Horn comes on as soon as I turn the key."

Apparently the pre-wired set-up isn't for switched ground on the 900!
 

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If it were me, I would check and double check the wiring again and if you can't pin it down, call Stebel. I am sure they have a troubleshooting line that can help. Just a sugestion my friends,,,,IMHO
 
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