I did not see the horn relay there, but it could have been. I will look more into it when I run the wires back here in the next couple days and post up what I find. the horn does not work anyway (not even any contacts in the wheel).
The 72 uses a unique horn relay. It has a large stud on it to tie the main positive wires together under the hood. Even if it's broken the large stud acts like a terminal block for the wires.
The relay mounts on the firewall by 2 screws just to the inside of the brake booster.
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