There are only a few ground clusters, it's well worth the time to
disassemble, clean, and reassemble them.  Many weird things can
be cured that way.  Also check and possibly clean contacts in
the fuse box; check/clean/replace  fuses.  The horn doesn't
have a relay, it's a circuit that's as simple as it can get.
Either the power feed (fuse) side is weak, or the ground is.

The GP relay is fairly stupid in that vintage, so if it's
coming on it's either sick inside, or the key signal to it
is flickering.  (That can be the ignition switch.)  It doesn't
have much of an agenda.

And of course, don't forget the 'mother lode': the battery
and its connectors.

-- Jim


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