two things ! those horns> their wires tend to get open. it is easy to check that, check your amplifier first these same when they have current> there is a connector that goes up to the bluetooth plate and there the signal enters the pre> this you can check directly by putting the signal> this is to check that the section of the amplifier this all right. and there is another connector that is also from the amplifier to the pre> card where there should be more and less 15v.