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Find your old horn; it's usually on the radiator core support either on the engine side or behind the grill.

There is a wire with a plug on the end, remove that, there is bolt or 2 to remove.

Take your old horn to the wrecking yard for matching up. The reverse is how to hook it all back up.

Do not recommend you have your head under hood when testing horns.

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Q: How do you change horn 1999 gmc seirra?
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