So through out all last show year my train horn, a 15'' single trumpet, 176db,mounted behind the front bumper acted up. Worked sometimes *& sometimes not!! I replaced the button,& solenoid, still same problem. So I finally found another single trumpet & ordered it,ony to find the front bell way to big to go in the same spot! Got it mounted today ,think it will be OK, I still have to remove the bumper & the old horn,see if I can repair it!