First post said horn blows with black wire UN-plugged. This means it has power on it.
Hook test light to negative/ground/earth and see if it lights up when you probe the black wire at the relay connector. We know the black wire at the horns has power on it when it shouldn't have. Got to find out why. Power is getting to it from something besides the relay.
Wild guess
The two ends may not be the same black wire. Small grounds or power connections may have gotten switched at the battery terminals.
Clay
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