.... I must be slacking off. This week the only new goody is a Stebel air horn. It's approximately 6" cubed and is a heavy current draw... instructions say to use a 30 amp fuse... so I did.
I had several electrical problems with this install... probably because of the Spyder's CAN-BUS electrical system. So... I did a little more than one would usually do to hook up a horn. For example, one continuing problem that resulted from hooking it up to my accessory-switched add-on fuse box entailed the horn continuously honking
after the 15-second delay ended for the switched power. Strange stuff from the CAN-BUS system.
I wound up leaving the the stock horn intact... so that the "system" would be dual tone. The Stebel states it is a 300 m/h horn... the stock is about 500-600 m/h. They sound good together.
The stock horn is negatively-switched (surprise). In order to overcome the Can-Bus gremlins, I tapped both the positive and negative connections at the stock horn and ran the new wires back to the relay (supplied with the Stebel). I also used a direct battery connection for a power supply instead of one of my open fuse circuits. Ground for the horn also comes directly from the battery.
The relay connections used were as follows:
#30 - positive directly from battery (fused at 30 amps)
#86 - positive from tapping into the existing horn
#85 - negative from tapping into the existing horn
#87 - positive to the Stebel's positive terminal
A separate ground wire from the battery was run to the negative Stebel horn terminal.
Mounting: only one hole needed to be drilled for mounting using the bolt/nut that came with the horn. See the second picture.
This is not one of the high-toned motorcycle-specific horns. It does sound like a car or truck. I like it!
BTW, I purchased it on eBay (with a spare) for about $45 each, shipped. Search "stebel truck" and you'll find it. I have used "Freeway Blasters" (non-air) on other bikes and they are about the same as this.