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Todd is correct. Excessive current is flowing through the relay contacts and overheating them.
For the previous posts, remember that all things being equal, the load in the circuit, the horn in this case, determines the current flow through the circuit, and beyond that:
More circuit resistance = reduced current flow and less voltage to operate the load
Less circuit resistance = increased current flow
The suggested method to measure current flow is with an ammeter connected in series in the circuit. But then what? I don't think the factory provides current specs. for a horn.
Test each horn separately. Connect an ammeter to the power side of the relay circuit (anywhere) and compare the current flow through each horn. I think you'll find that one of the horns is faulty (drawing excessive current). A suitably-sized inline fuse might be a good idea when doing this to avoid damaging a good relay.
Sherwood
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