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Prepping to install my screaming banshee horning system and after peeling back the heat wrap on the wires it appears I have a green and a black and white striped wire connecting to the stock horn. Since I do not have a maintenance manual I cannot confirm if the green wire is the positive wire or not. I presume it is.

Also anyone know if the horn on this bike is a positive or negative signal that energizes the horn? I have heard some BMW's are negative.
 

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My 2012 Roadster has a green and a brown wire to the stock horn. I would assume the green is positive. The horn & turn signals have a brown wire and a colored wire. Then, my flashlight died. Wires to the battery negative are brown according to Haynes Manual 4925 DOHC Twins 2010-2012. Hope that helps you some sup909. Drdave just loves loud horns, too. Good luck!
 

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I'm fairly certain that the brown wire is negative and the green, positive. To be certin try a voltmeter on the green and any ground. Honk the horn. If the needle moves, the green is positive.
 

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Hi guys i am considering installing a screaming banshee on my new r, but my bmw dealer in spain was concerned that the the bike uses a CANBUS system, i can see from the Banshee website that they write this "Regarding bikes/cars with CANBUS and sensitive electronics here is some information: The system has been designed to not back feed electricity into the vehicle horn electrics at all. Also, we have the included protection for the Banshee Horn control circuit to guard it against spikes from the air horn compressor. The control circuit draws this power directly from the battery which is about 18 amps when the air horn is on, this shouldn't pull down the voltage in the rest of the vehicle enough to trigger an error / fault code. There are other systems like the starter motor that draw much more current – 200+ amps, and this doesn't trigger a fault code." but have any of you sourced specialist adivice ? it seems it shouldnt be any problem but .........sup909 how is it working ?
 

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Discussion Starter #6
Hi guys i am considering installing a screaming banshee on my new r, but my bmw dealer in spain was concerned that the the bike uses a CANBUS system, i can see from the Banshee website that they write this "Regarding bikes/cars with CANBUS and sensitive electronics here is some information: The system has been designed to not back feed electricity into the vehicle horn electrics at all. Also, we have the included protection for the Banshee Horn control circuit to guard it against spikes from the air horn compressor. The control circuit draws this power directly from the battery which is about 18 amps when the air horn is on, this shouldn't pull down the voltage in the rest of the vehicle enough to trigger an error / fault code. There are other systems like the starter motor that draw much more current – 200+ amps, and this doesn't trigger a fault code." but have any of you sourced specialist adivice ? it seems it shouldnt be any problem but .........sup909 how is it working ?

I am actually hoping to give the installation a go in a couple of weeks if I get some good weather. I had an initial issue with my new bracket order from Banshee but got that straightened out and they shipped me the stuff last week. I will be using posi-taps so hopefully any impacts on the wiring should be very minimal. I suppose I will just have to hook it up and if it blasts me when I power on the bike I know that I have a negative fed horn system on the 1200r.
 

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The brown wire is ground 99% of the time according to local BMW dealer and that is the case with the horn on my '13 RR. I just installed twin Hella trumpet horns (mentioned in the OMFG horn thread). I just cut off the supply side power to the factory horn and ran the wires to new horns with no negative effect on canbus.
 

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The brown wire is ground 99% of the time according to local BMW dealer and that is the case with the horn on my '13 RR. I just installed twin Hella trumpet horns (mentioned in the OMFG horn thread). I just cut off the supply side power to the factory horn and ran the wires to new horns with no negative effect on canbus.
You can also leave the BMW weeny horn in place if you are not putting your OMFG horn in that space. I have my Stebel Nautilus on its own relay and just left the original horn wired in. The weeny horn bleeps a fraction of a second before the Stebel begins its Depends wetting blast.
 
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