I am having problems getting my air horn to work with the key on. It works great when the key is off, but as soon as the key is on - no deal. I have spliced into the horn wire inside the front faring by the handlebar, but am confident that I did something wrong.
thoughts?
I'm confused, not my first time either.
How is it that the horn even works with the key OFF?
As for not working when the key is on, try starting the bike. Sounds like there isn't enough power in your battery to run the lights and the horn at the same time. You need the alternator running to supply more power.
Like Chris mentioned, replace back to stock.
This time, unplug the OEM horn wire from the horn, and use that to trigger the new horn relay. Power goes from the battery-relay-horn. The horn wire works as the trigger for the relay, allowing the power to pass through.
Now, it sounds like you have the relay wired wrong, since there should be no trigger when the key is off.
I found this link to a relay and how to wire.
http://www.valkyrieforum.com/bbs/index.php/topic,87466.0.html