Steering wheel help

I just got my new nogistalia steering wheel and I am tring to follow the instructions, it says to either disconnect the battery or the horn fuse first. I don't want to mess up the good connection on the battery so if someone could help me locate the horn fuse quick, that would be appreciated.
 
The previous owner of this car did not want the battery cable being removed, there is silicon around all of the wire connections to the battery, so now i need to know which fuse to disconnect to get my horn to stop honking while i remove the old Steering wheel, if someone can tell me what the wire looks like or a pic of the wire from a 65 mustang, it would be greatly appreciated.