The wire going out from the fuse box is supposed to have a 12 volt current that activates the horn . Just get your self a test light or multimeter to probe it while the horn is blowing and see if you either get light or right at battery voltage . You should be good .
SGT OF MARINES
DARK GREEN 95 YJ 2.5 6'' ROUGH COUNTRY LIFT,10k BULLDOG winch , metalcloak custom bumper, metalcloak front and rear fenders with 4'' flares. spectre cold air intake , electric fan setup,dynomax exhaust,NO CAT< 4 bangin mudslingin green machine!!
SILVER 2012 5.0 MUSTANG GT BREMBO PKG 3:73'S,pypes super system catback exhaust