[The Art Doctor]

When diagnosing a horn issue I always start by hooking them directly up to a battery and see if it is the horn or the wiring at fault. Almost always its the wiring as a direct wire job will usually result in a loud blast. But on occasion the points/electromagnetic doohickey within can get stuck. As a kid I remember my dad would then spray into the horn opening with carb cleaner and rap it with a screwdriver handle to free it up, sometimes adding some WD-40 for good measure. Not sure if either of those are just old farmer fixes but they worked and we never bought a new horn that I can remember. I grew up in the northeast where rust and corrosion were prevalent and fixing a horn was not all that uncommon of an event whether it be corroded terminals or corroded innards.