Stebel Air Horn Wiring diagrams the easy way. 3 versions
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  1. #1
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    Default Stebel Air Horn Wiring diagrams the easy way. 3 versions

    OK guys after 4 years I finally got around to wiring a Bad Boy Air Horn on my bike. I've installed about 30 now for a few friends and riders by disconnecting the stock horn connector then running wires back up from the connector to trigger a relay I supplied 12 volts to inside the headlight nacelle. I figured there has got to be an easier way so I tried just tapping the horn wire from the horn switch black with blue tracer wire but it rest at ground and would trigger the horn with the key off. Well being this was my bike I took my time looked over the schematic and figured it out. So now you don't have to catch the wires from the horn connector you can catch the trigger wires from the headlight nacelle. Still have to run a power wire from the battery but hey this is easier.



    You can do the following by wiring the way stated.
    Air Horn Only: Cut the black wire with blue tracer. Tape off wire going to Horn. Connect switch side of wire to terminal 86 of relay.This will eliminate the stock horn with out disconnecting the harness from it.

    Air Horn and Stock Horn:In my case I installed in the stock horn location a high output electric car horn. A pain in the A$$ to squeeze it in but I'm happy with it even more now with the added air horn. Just tap black wire with blue tracer.

    Air Horn or Stock Horn via Switch: See Diagram Below

    No Matter what you do this will remain the same
    You can connect the 85 terminal of the relay to the orange with green tracer wire (it's the same wire that goes to the horn)going to the Tachometer.It also feeds the start switch and speedometer. It's inside the headlight nacelle. No need to go all the way to the horn and fish wires back up.

    For your Battery power wire running to the Relay,Air Horn, and Ground please use a minimum 14 AWG wire. Fuse it with a 25 AMP fuse at the battery.

    Diagrams
    Air Horn Only
    https://www.m109riders.com/forums/alb...chmentid=75067

    Air Horn with Stock Horn.Both on at same time.
    https://www.m109riders.com/forums/alb...chmentid=75066
    with switch to turn air horn off or on .
    https://www.m109riders.com/forums/alb...chmentid=75098

    Air Horn with Stock Horn Switched. Either or.
    https://www.m109riders.com/forums/alb...chmentid=75068

    Hope this helps you guys out. Enjoy and Ride Safe!
    Last edited by Robert May; 09-23-2012 at 08:57 PM. Reason: uploaded 4th diagram

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    Radio Active Member Zoom's Avatar
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    I knew there had to be a way to tap into the horn wire without using the connector, and thanks for finding it Robert!






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    Very Active Member KINGZM109R's Avatar
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    Thank you. I will be doing the both on install.

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    Very Active Member Eminem's Avatar
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    Thumbs up

    ....just noticed a small typo on yr schematic - it's an 'SPST' switch (single pole, double throw) you'll be needing for the 'both' option - btw, rated around 3-5A.
    Hope that helps.

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    Quote Originally Posted by Eminem View Post
    ....just noticed a small typo on yr schematic - it's an 'SPST' switch (single pole, double throw) you'll be needing for the 'both' option - btw, rated around 3-5A.
    Hope that helps.

    Yea not so much a typo I just omitted the switch period for the both option. However thanks and I will add one more schematic with a SPST Switch that way it will cover everything.

    Thanks again Eminem !!!

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    Red face Dumb Questions

    Ok ... Not finding a Stebel, I bought a Euroblast horn that looks identical. Except - it's chromed.
    It's supposed to deliver 140+ decibels. I hope it's a good unit.
    After reading all I could find here - it looks like there are only two good locations for the horn.
    Either the headlight housing, or the right side cover. And both require a wire run under the tank.
    So ... after due consideration - I think it'll be in the headlight housing. I hope it's still loud enough. (a semi almost got me a few days back - pulled over on me. Glad the 109 has a ton of power!)
    Now for my questions;
    Is there a good mounting place inside the housing? Does a bracket need to be fabricated?
    And, most important .... Is there a place in the headlight housing to pick up the needed 12 volt supply (which can be switched), without running a wire back to the battery (which is on all the time)?

    And BTW ... A big THANK YOU to all of you on the M109riders forum!!
    This forum is a big help to me.

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    Very Active Member matt.procter's Avatar
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    Thanks! Will make this weekends install much easier!

    2007 Black M109R
    Velocity Pro exhaust, low n mean chin scoop, low n mean reaper fender, fi2000r, painted speedo housing, custom radiator grill, meancycles engine cover, Stebel Nautilus, Ryan's harness, Greggs side cover...

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    Very Active Member Big-B's Avatar
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    Quote Originally Posted by OldMarine View Post
    Ok ... Not finding a Stebel, I bought a Euroblast horn that looks identical. Except - it's chromed.
    It's supposed to deliver 140+ decibels. I hope it's a good unit.
    After reading all I could find here - it looks like there are only two good locations for the horn.
    Either the headlight housing, or the right side cover. And both require a wire run under the tank.
    So ... after due consideration - I think it'll be in the headlight housing. I hope it's still loud enough. (a semi almost got me a few days back - pulled over on me. Glad the 109 has a ton of power!)
    Now for my questions;
    Is there a good mounting place inside the housing? Does a bracket need to be fabricated?
    And, most important .... Is there a place in the headlight housing to pick up the needed 12 volt supply (which can be switched), without running a wire back to the battery (which is on all the time)?

    And BTW ... A big THANK YOU to all of you on the M109riders forum!!
    This forum is a big help to me.
    The info on the wiring was given in the first post. You can just lay the horn in the upper part of the nacelle and secure it w/ a tie wrap if you're so inclined.


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    Can't figure this thing out. Verified wiring taps yet again, switch on bike without power to Wolo and still get relay clicking. Then hook power to Wolo and instantly get Wolo horn blowing without pressing horn switch. Next step is to replace Wolo.
    SOUTH GEORGIA 9'ER......AND I'M GONE

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    Very Active Member AWESOME109's Avatar
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    Quote Originally Posted by Quepsiphi18 View Post
    Can't figure this thing out. Verified wiring taps yet again, switch on bike without power to Wolo and still get relay clicking. Then hook power to Wolo and instantly get Wolo horn blowing without pressing horn switch. Next step is to replace Wolo.

    If your relay is clicking when you switch on the bike then you have wired this thing incorrectly. The horn is not the problem. I would recheck to make sure you are spliced into the correct wires. Almost sounds like you have spliced into the wire before the horn switch.
    Last edited by AWESOME109; 03-05-2013 at 12:27 PM.

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    Thanks Awesome109! You hit the nail on the head. Tapped into wrong wire for horn switch.
    SOUTH GEORGIA 9'ER......AND I'M GONE

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    Quote Originally Posted by Quepsiphi18 View Post
    Thanks Awesome109! You hit the nail on the head. Tapped into wrong wire for horn switch.
    Glad you found it. Now get out there and start scaring the heck out of those cagers with your new horn

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    Yep one of the wires rest at ground with the key off therefore triggering the relay.

    Thanks AWESOME109 for jumping in . My real job is trying to kill me right now.

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    Gday fellas. I know this is a very old thread, but I wanted some idea as to where everyone picked up the earth for the air horn when mounted behind the headlight. Did you run an earth back to the battery, or is there somewhere on the triple trees to earth from? Is it ok to earth from here, or would that send power through the steering stem bearings and damage them? Thanks in advance.

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    Quote Originally Posted by TonyP View Post
    Gday fellas. I know this is a very old thread, but I wanted some idea as to where everyone picked up the earth for the air horn when mounted behind the headlight. Did you run an earth back to the battery, or is there somewhere on the triple trees to earth from? Is it ok to earth from here, or would that send power through the steering stem bearings and damage them? Thanks in advance.
    I grabbed mine right in the headlight bucket 12mm bolt on each side towards the bottom corners.
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    Default Quick question

    I'm following the wiring diagram for "both horns". Before splicing any wires I checked the blk/blu wire with a test light to see if its energized when horn button is pressed, and found it to be hot with key on. Test light Does go off when button is pressed (blowing stock horn). I've checked all other wires coming from left controls and none in that loom change when pressing button.
    If I wire it up per diagram, I'll have the same problem Quepsiphi18 had.
    What am I doing wrong?

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    Quote Originally Posted by Pockets View Post
    I'm following the wiring diagram for "both horns". Before splicing any wires I checked the blk/blu wire with a test light to see if its energized when horn button is pressed, and found it to be hot with key on. Test light Does go off when button is pressed (blowing stock horn). I've checked all other wires coming from left controls and none in that loom change when pressing button.
    If I wire it up per diagram, I'll have the same problem Quepsiphi18 had.
    What am I doing wrong?
    The "Hot Wire" to the stock horn is energized (12vdc+) when the ignition is turned on.

    The horn button is actually making (closing) the "Negative wire" (12vdc-) to your stock horn when you push the button.

    So you can wire your Stebel horn relay the same way.

    If you attach the + and - from your stock horn to your sebel relay coil then the relay coil will become energized when you press the button and close the really contact closing the new circuit that you ran through the relay contacts to your stebel horn.

    If you are reading this and still scratching your head then please draw out you circuit the way you perceive it so we can have a look and put you on the right path.

    If I get time I will make a drawing and post it up.

    BCS
    Last edited by Bering_C_Sparky; 04-20-2019 at 12:51 PM.

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    Very Active Member Kazimodo's Avatar
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    Sparky is right , stock horn has + all the time , and when you press the handlebar button
    you then add the ground ,
    you need a 25Amp fuse for each air horn ,
    you need a relay for each air horn ,
    trigger both relays with spliced black wire /blue line , feeding terminal 86 on relays
    any orange wire with green line you can find to terminal 85 on relays

    when this is triggered , the bigger juice will pass from terminals 30 to 87 .
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    Quote Originally Posted by Pockets View Post
    I'm following the wiring diagram for "both horns". Before splicing any wires I checked the blk/blu wire with a test light to see if its energized when horn button is pressed, and found it to be hot with key on. Test light Does go off when button is pressed (blowing stock horn). I've checked all other wires coming from left controls and none in that loom change when pressing button.
    If I wire it up per diagram, I'll have the same problem Quepsiphi18 had.
    What am I doing wrong?
    Why splice any wires? It can create different issues and more places to have problems. There are true plug and play kits out there. And not just ones that give you a box of materials but a truly built harness.
    Last edited by rynosback; 04-20-2019 at 03:50 PM.
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    OK, without going into my background of being a CNC tech, let me just say that I understand wiring and relays. And I understand that pressing the horn button completes the circuit to the stock horn. I was trying to keep my question brief, thinking maybe someone else had already run into this problem and that there was an easy answer.

    Sparky, you said horn button is wired on negative side, but diagram shows its on positive.?
    And instead of running wires from stock horn to relay, I'd like to keep everything inside the headlight housing if possible.

    Just to clarify. Everything is in place and ready to go. The air horn and relay is in behind the headlight, the 14 ga 25 amp fused hot wire from battery is routed, and all thats left is to tap into the org/grn and blk/blu wires for post 85 & 86 of relay, like diagram shows.
    Now, again. If I wire it per diagram, as soon as I turn on the key, the blk/blu wire will become hot, energizing the relay, which will complete the circuit to the air horn, thus causing it to blow.
    I'm no stranger to having brain farts, but I know I can't wire it that way. What am I overlooking?

    (Put headlight back on and will revisit when Cyclops bulb comes in. So anyone reading this that wants to comment, it'll be a few days before I tear it back apart.)
    Last edited by Pockets; 04-20-2019 at 07:07 PM.

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    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by Pockets View Post
    OK, without going into my background of being a CNC tech, let me just say that I understand wiring and relays. And I understand that pressing the horn button completes the circuit to the stock horn. I was trying to keep my question brief, thinking maybe someone else had already run into this problem and that there was an easy answer.

    Sparky, you said horn button is wired on negative side, but diagram shows its on positive.?
    And instead of running wires from stock horn to relay, I'd like to keep everything inside the headlight housing if possible.

    Just to clarify. Everything is in place and ready to go. The air horn and relay is in behind the headlight, the 14 ga 25 amp fused hot wire from battery is routed, and all thats left is to tap into the org/grn and blk/blu wires for post 85 & 86 of relay, like diagram shows.
    Now, again. If I wire it per diagram, as soon as I turn on the key, the blk/blu wire will become hot, energizing the relay, which will complete the circuit to the air horn, thus causing it to blow.
    I'm no stranger to having brain farts, but I know I can't wire it that way. What am I overlooking?

    (Put headlight back on and will revisit when Cyclops bulb comes in. So anyone reading this that wants to comment, it'll be a few days before I tear it back apart.)
    Not sure what diagram you are looking at but I can assure you that the wiring diagram for the M109R shows that 12vdc - (negative) is what is switched through the horn button.

    The reason you read 12vdc + on the B/Bl wire when not pushing the button is because you are reading this though the horn.
    There is 12vdc + on one side of the horn when ever the ignition is turned on.
    When you push the horn button it closes a N/O contact, 12vdc - is then applied to the other terminal on the horn and the horn blows.
    If you have one lead of you tester on the B/BL wire and the other on ground (frame or neg wire) you will read voltage, but when you press the horn button and close the contact on the switch now both of your tester leads will be at the same potential and you will read 0 volts.

    BCS
    Last edited by Bering_C_Sparky; 04-20-2019 at 08:40 PM.

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    Where is the stock horn located on the M109R?

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    Very Active Member "Hunter"'s Avatar
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    Quote Originally Posted by Baldi View Post
    Where is the stock horn located on the M109R?
    between the engine block and the radiator above the cooling fan


    Last edited by "Hunter"; 05-18-2019 at 10:05 AM.
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    Quote Originally Posted by "Hunter" View Post
    between the engine block and the radiator above the cooling fan
    Thank you, Hunter!

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    Very Active Member FlyingCircus's Avatar
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    Do not use the wiring diagram saying blue wire. Maybe I didn't read it correctly but the blue wire that looks like it is for the the original horn is actually for the radiator fan, not the horn. Maybe for different year? Anyway I followed the diagram and it didn't work and messed around further to see the Blue and Black are radiator fan. Works great now wiring wise. The Stebel horn connection from the compressor to the horn sucked for me. Sounded like crap until I compressed the two together, then sounded like I thought it should. So tomorrow will be using silicone on that connection and a large stainless hose clamp to compress and hold the two parts together

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    Very Active Member Kazimodo's Avatar
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    Good catch Flying Circus ,
    where it says blue wire in the install instructions by Hunter ,
    should have said BLACK with blue line
    unless he meant the other wire ( orange wire with blue line ). confusing instruction ...
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    I wonder how the horn plastic part would handle the heat. I'd rather not have it enclosed. Since I have the bags I don't need the small area beside the battery anymore. I can make the compressor fit in there. Then run an air line

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    Quote Originally Posted by FlyingCircus View Post
    I wonder how the horn plastic part would handle the heat. I'd rather not have it enclosed. Since I have the bags I don't need the small area beside the battery anymore. I can make the compressor fit in there. Then run an air line

    Sent from my LG-H933 using Tapatalk
    Some people have had the horn go bad being placed by the radiator. The best place in my opinion is in the headlight bucket or using a bracket mounting it under the side over which placed the horn behind the rear wheel. I ran mine there for 8 years until I sold my bike. It people place other mods there so the headlight bucket is really the ideal place in my opinion. 99.9% of the plug and play harnesses I have made are for the headlight bucket.
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    Quote Originally Posted by rynosback View Post
    Some people have had the horn go bad being placed by the radiator. The best place in my opinion is in the headlight bucket or using a bracket mounting it under the side over which placed the horn behind the rear wheel. I ran mine there for 8 years until I sold my bike. It people place other mods there so the headlight bucket is really the ideal place in my opinion. 99.9% of the plug and play harnesses I have made are for the headlight bucket.

    Thanks for you expertise. Headlight bucket looks like the easiest place. Do you lose much DB in there? obviously much better than stock. Where abouts behind the rear wheel?
    Last edited by FlyingCircus; 05-16-2019 at 11:07 PM.

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