Take the horn and put a wire on the connection on the horn and ground the bracket to the neg post of a battery and run the wire to the pos post horn should sound. 12 volts won't hunt the horn for a test.
"If it ain't Steel it ain't Real" "Earth the insane aslyum for the rest of the Universe" 41 1/2-ton, a work in progress 68 Shortbed stepside 327/325hp/700R4