Patton and Ed, Ordered a Wolo Chrome Air Horn # 519 for my 75' Wing and instead of jumpering off my stock horn 2-wire harness connectors, I ran jumper wires directly off the battery terminals to the horn terminals.
Wow !!! Made me jump, really loud. So then I took the Fiamm horn I tested earlier but instead of testing it at the horn harness connectors like I did earlier, I used the same jumper wires as above for the Wolo horn and ran them to the Fiamm horn.
Same great results, nice and loud as referenced in this Post from other members.
So what gives ? Why are these horns working as they should coming directly off the battery, where hooking them up to the horn harness then using the horn button resulted in a lower noise output ?