It's easier to use the existing BMW relay which works fine with the nautilus. Just change the connectors at the horn ( the spade connectors are different size) and fit the nautilus. I have done this on 4 GS's this way - no problem.
I'm planning on doing this. It seems that for pre-canbus systems, the existing relay works just fine, right?
Yep fitted mine two years ago no problems.
The link above has a "knock off Stebel" for £24 plus postage. Here is one for £17 http://www.ebay.co.uk/itm/12v-136db...rg=20140107105714&rk=4&rkt=30&sd=251146688116. I wonder what the difference will be between the real and the Chinese one ?
.....I generally give the wrong doer a blast of the left indicator......
I switched the controls so that now the left indicator switch operates the horn (twin Fiamms - very loud) and the original horn button now operates the left indicator. Problem solved.