« Reply #3 on: March 20, 2016, 12:04:12 PM »
The Stebel draws 19 Amps and the original horn uses less then 10 Amps. The Air Horn therfore needs a seperate relay and fuse.
I found out the hard way that using the original horn wires and fuse/relay didn't work on a longish blast at an errant motorist. The fuse blew.
Even though I'd supplied Airhorn and relay, Team Moto at Virginia didn't think the relay was required.
Gadget is right, I used the original horn wires to activate the relay supplied with the airhorns, the power for the airhorns is supplied by cable directly from the battery to the relay, thus using the OEM horn wiring in this way draws very little current . . Just enough to switch on the relay . . Never had any problems with this circuitry.
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Terry, Canberra 0412499625
Ulysses #22354, FarRider #761
Current bikes 2013 Triumph Trophy SE, 2008 ST1300
Previous bikes1948 Triumph Tiger 500 Twin - sprung rear hub, 1963 BSA Bantam 175, Yamaha 75cc & DT250, Honda ST1100, 400N & CX500 sports, BMW K100RS & K100 LT, Harley Electra-glid