CAR ALARM WOULD GO OFF WHEN EXITING THE VEHICLE AND THE HORN WOULD GO OFF. THE FAILURE OCCURED WHILE DRIVING ON A MAIN ROAD, THE ALARM HORN ENGAGED AND WOULD NOT SHUT OFF. AFTER APPROXIMATELY 10 MINUTES OF CONTINUOUS HONKING THE WIRES TO THE ALARM HORN STARTED TO MELT. I ATTEMPTED TO DISCONNECT THE POWER TO THE HORN AND WAS BURNED BY THE WIRES. EVENTUALLY THE HORN DIED BUT SMOKE CONTINUED TO POUR OUT FROM UNDERNEATH THE COWLING.