I was given a set of Bosch dual horns today. It came with a relay, but no wiring diagram. Since my factory horn quit, I already put one of them on. It works great, but it has me thinking about installing the second one. I don't think you can have too much horn on a bike in a city like Dallas.
My question is; wouldn't the bike's horn already be run through a relay? Would it be absolutely necessary to use this one to run the duals?