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I had the same problem, only one horn working. I found a replacement horn cheap one, my mistake it worked for 1 beep then both horns quit. I took it to the dealers and both horns were bad, the dealer replaced with GM horns not cheap $75 a piece but at least I can be heard now
One more thing any replacement horn is not a direct plug in, even the GM horn will need to have wires cut and spliced in