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Try connecting power directly to the horn and see if it goes off. If not, it would seem it needs replacing. If it works, maybe the horn switch on your steering wheel is broken. A simple process of elimination.
when pushing on the horn pad you may hear a click noise this tells you the circuit is good from the horn pad to the horn relay and out to the horn. find the horn and check for power at the horn terminal when the horn pad is pushed. if it lights up then replace the horn. if it doesn`t then you will have to check for a wire problem from the horn back to the relay. but horns are usually the problem.
You can replace the horn. Check to see if the wires connected to the horn have power. Check with a test light. If power is present then the horns are bad.
the battery may be faulty,just because the lights & horn work doesn't mean that the battery is enough power to start the engine the battery may have a weak sell that breaks down when you engage the starter try turning the headlights on & then try to start the engine & see how dull the headlights become,if they almost go out the battery is very low or faulty......hope this helps......cheers.
Check that the horn itself is not worn out. If it's not sounding when grounding out, or it has a history of being faint in volume, then replace the horn.
Horns do go bad over time due to atmospheric moisture causing the contacts to corrode.
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