Devin: there is a wiring diagram posted in this thread: click on it to make it HUGE. You can save it as a picture and print it off. This should help you http://www.jalopyjournal.com/forum/showthread.php?t=743077
The click noise is from the relay next to the voltage regulator. Is there power going to the horns when the relay clicks? If the horns are shorted you must disconnect the wire to test for power. Probably rusted contacts inside the horns.......