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Looks like bad news if the relay is sticking:
From the service manual:
Horn relay: in Central Junction Box (CJB), (not serviceable)
If you find that the relay is the problem, I think I'd be bypassing the CJB and installing a standard relay in the horn circuit.
The horn output from the CJB should be a yellow/lt green wire coming from pin # 9 on the CJB connector, and the wire coming from the horn button and VSM is Dark green at Pin #19 on the CJB connector.
Good luck - hit it with a hammer. That may work.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
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