Tuning and modding » Adding in an auxillary horn

So today I am fitting an extra horn to my RS, and need to tap into the wire feeding the old one. I'm struggling big time with access though. I've found the following video online, and the guy seems to simply reach in and slide off the connector; however that's not happening here. Although I have all the side panels off, access is pretty limited, and I assume the plug must also have a lock of some description. I really don't want to end up having to to dismantle the whole front end too. Has anyone been there, done that, and got this particular T-shirt?

Must admit, it looks awfully complicated. It was much, much easier on my R1150RS! Simply paralleled with the existing horn. According to the video, an interposing relay is required but I guess that depends upon the current draw of the new horn. I seem to recall that from one horn supplier you could parallel with the standard horn and a special connector was available to do this.

I look forward to seeing replies from members who have carried out this mod and hopefully, an easier method!

Got it sorted eventually, thanks... I never did manage to disconnect the damned plug from the horn, but instead was able to tap in to the feeding wire using a Posi-Tap connector, and took that to the relay. Both horns are now working fine (I nearly deafened myself in the garage last night!).

I never actually tried not using a relay; I just assumed it would be necessary and in fact I already had it 'in stock', along with the horn and associated wiring, from my previous bike. - I guess the R1150RS is pre-CanBus? For what it's worth, I did also spot this CanBus horn wiring kit online.

I went for the simple option of replacing the original horn (if that’s what it is !) with a Denali soundbomb, a bit fiddly but otherwise a straightforward replacement with a very minimal removal of bodywork. The sound is a significant lower tone and louder, I’d like even more volume but still a great upgrade.

The first job I did in October 15 on getting the RS was to fit a pair of Fiamm horns using a relay from a fused lead from the battery. I have used this set up for decades. The only modification I made was to take the earth leads from the horns back to the battery itself. I used crimped connectors (with a proper crimping tool, not the POS made out of stamped metal) and all is well.
Fitting the dual horns was simple for me, as I do not run a light bar, nor the Avant guard. The boss for mounting of the crash bars is used to mount the horns just inboard of the lower fairing panels.
To do it properly (which was not the way I did it initially) I think it is best to remove the original horn. I use its mount for the relay. To do that you have to take the top of the fairing off. This is a bit of a fiddle, but by the time you have it stripped down, you can run the wires easily to the battery.
My fitment on the R1100S gave me difficulties with the earth return, as the earth point for the rear mounted horn (there was no room up front) was through the aluminium frame, and that would set up a resistance after some months and make the horn inconsistent.
Otherwise I had purchased, in anticipation of making the mod, the plug adapter from Nippy Norman to connect the original horn circuit to the low draw side of the relay. I used heaviergauge wire for the power and earth, compared to the standard BMW gauge.