Horn issue...

Diagnoses methodolgy is same as before.
Horn is power is joined to the main circuit at the alternator.
IF the battery is charged and in good condition, then the connection or wiring has too much resistance for the higher current needed to run the horns.
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Update, the horn works, it was indeed the relay, just a coincidence.

I can't recall for sure but thought there was a photo from your car with a hacked up harness at the alternator.