How to wire train horn to stock horn for alarm purposes?

[mts678]

I'd like to connect my train horn so that my aftermarket alarm will chirp and blow when the alarm is set and when the horn chirps when locking and unlocking the truck. I have the train horn on off switch to upfitter 1. Just most sure exactly how to make this work. I don't want the train horn to blow when you honk the stock horn, I just want the train horns to sound when activating/ deactivating/ and sound when
The alarm goes off.



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[JesseKK]

Connect teh air valve teh horn. U are probably goin to hav to use a manual switch so it doesnt open teh air valve when using ur regular horn. That should scare teh thief.

[mts678]

Gotchya. Yeah that's my main purpose to scare the thief.. My 05 f250 was stolen so on this truck I told myself is connect the train horns to the alarm


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[ZMANN]

your alarm has a siren output you would just use that and wire in a relay

if your alarm is using the stock horn I would disconnect it and use a separate siren anyway this will eliminate your horn honk /air horn activation issue

[mts678]

This is where this is confusing for me... Because is t the stock horn circuit completed when its grounded? And my train horn is + activated. You can't connect the positive a d negative can you?

[Snake]

No, you can't. Thinking.....

[ZMANN]

the alarm output either has two leads or is programmable for +- output

what alarm ?

[ZMANN]

also if u take the OEM horn out of the alarm and have a neg trigger
it will work fine because of the relay u need to use can be activated by either +or-

[ZMANN]

85 would be the alarm horn output and 86 wouldn't be switched just fused or jumpered to the pos lead 30

[mts678]

Ah ok I see. That makes sense, I think.. Whenever running a relay I have to lay it out and diagram it myself for it to make sense. It's a viper alarm, I'd have to check the PDF manual to see which version it is.