It may not be an alarm though the switch on the A10 main panel. Added: Ditto Ward, he needs more info. You can disconnect the horn wire to determine fault source. Horn button though we are almost certain of. Weve had about four of these over the life cycle, mostly in your boats age range.Last edited by Bass Cat Boats on April 25th, 2014, 12:35 pm, edited 2 times in total.