Horn wiring

[84GMCSierra]

I have a question for you all. I bought an air horn off Amazon, and it only haas 2 wires: Black and Red. Black obviously goes to a ground, but can I connect the red to the factory green horn wire to use the factory horn button?

 

[fast 99]

Make sure they won't overload the circuit. There are very few 30A circuits. May need a relay.

 

[84GMCSierra]

Make sure they won't overload the circuit. There are very few 30A circuits. May need a relay.

but can I connect directly to the green horn wire or run a separate horn button?

 

[Jgonick]

This image is typically how the horn works. It all depends on what size fuse is used in the circuit (My guess is 20 amp) and how many amps your horn pulls. Also you have other things on the circuit that are also using amps. Probably Dome light & cig lighter etc... Your picture shows your new horn needs 30 amps. so you cannot just attach it to the green wire.- The circuit would be overloaded.

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[fast 99]

Installing a relay is easy. Provide fused power to relay on one side, hook horn to the other. Green wire will close relay.