help on alarm

[Fordfool302 10+ year member]

I have a set of air horns I got from my buddy, they came with a relay so I can tap right into the sirens power to make them work. The relay has 4 prongs on it. Does anyone know how to hook it up.

Thanks

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[bjfish11 5,000+ posts]

i think its something like, 1 is power in, 1 is power out, 1 is ground, and 1 is a remote turn on. Not 100% sure, so no one flame me. Did it come with a package? If so, there should be a wiring diagram on it.

 

[KaeZoo 10+ year member]

If the terminals are numbered: 85 and 86, connect one to the siren wire and one to chassis ground. Doesn't matter which is which.

Terminal 87 goes to the power source you want to use for the air horns.

Terminal 30 goes to the air horn.

Note that the output to the siren is constant while the siren is going off. Usually you don't want to run an air horn continuously; it should be pulsed. If your alarm has a horn honk output, that's a better choice to trigger the air horns.

 

[Fordfool302 10+ year member]

If the terminals are numbered: 85 and 86, connect one to the siren wire and one to chassis ground. Doesn't matter which is which.
Terminal 87 goes to the power source you want to use for the air horns.

Terminal 30 goes to the air horn.

Note that the output to the siren is constant while the siren is going off. Usually you don't want to run an air horn continuously; it should be pulsed. If your alarm has a horn honk output, that's a better choice to trigger the air horns.

Thats exactly what it has on it good looks for the info, this wont hurt the alarm will it.

 

[Fordfool302 10+ year member]

If the terminals are numbered: 85 and 86, connect one to the siren wire and one to chassis ground. Doesn't matter which is which.
Terminal 87 goes to the power source you want to use for the air horns.

Terminal 30 goes to the air horn.

Note that the output to the siren is constant while the siren is going off. Usually you don't want to run an air horn continuously; it should be pulsed. If your alarm has a horn honk output, that's a better choice to trigger the air horns.

Does 85 or 86 go to the positive side of siren, also you said 30 goes to air horn does it go to the positve or negative on it, if it goes to positve does negative on air horn go to its own ground.

Thanks alot

 

[KaeZoo 10+ year member]

It doesn't matter whether you use 85 or 86 to connect to the siren output; one goes to the siren wire, the other goes to ground.

I don't know exactly what terminals you have on your air horn. If it's just positive and negative, then I'd ground the negative and connect the positive to 30 on the relay. Then connect 87 on the relay to your battery. Be sure to fuse any wire you connect to the battery.