Not sure if your battery charger is up to the task? The original horn relay also has a "key left in the ignition" buzzer that you may be wired to? The AAW kit that I have deletes the buzzer circuit and only provides a horn wire. Also, my Camaro which is a base model only came with one horn so if your trying to run two I'm thinking again that it's the battery charger just not providing enough current?so when i hooked up my battery charger(2 amp) to check stuff out my new horns dont do any thing i used the relay (inside car)that came with the harness i also have new original type relay mounted were normally would be and used original harness as guide. when i push button i just buzzes the inside relay? so far everything else works as should.