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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | The definative way to answer your question is to use an ammeter to measure* how much current (units: Amps) your horn draws. With that information you can check your switch and the wire gauge you are running to see if they are rated for that much current.
Be aware that you will need to use the high current postion if you are using a standard multmeter to measure it.
Jerry's idea of repurposing a ballast resistor to drop it down is interesting. I have a 6V horn that I just rebuilt and it is *loud*. I might give that a try and see how it affects the volume.
*You could theoretically calculate the current based on the resistance of the switch/windings, but the ones that I have messed with have low enough resistance that the measurement error in consumer grade tools would be significant. | | |
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