becarfull... i had the same kinda of thing happen... was driving one nite and all of a sudden both horns go off for no reason! then go off
about a week later i finish working on the dart close the hood...
somebody said ur cars smoking...
i turned around and the car was engulfed in smoke, ripped the hood open and yanked the battery cable off...
half my wiring sheerness was burnt up, from the horn all the way up into the dash... one of them must have shorted out or something
just be careful...