My memory might not be accurate but:
Look high above your left foot for the horn relay.
Seems to me that it is mounted just above the fuse box, the little
black plastic box you should see there. Had to change it to get the
horns on our 82 4x4 to work.
Hated working on it as it takes me two hands to do the job but can
only access it with one at a time.
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