siren output as horn

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rikki_92

Member - Posts: 5

Joined: December 19, 2008

Location: Australia

Posted: December 19, 2008 at 7:26 AM / IP Logged

I have just installed a immobilizer to my 92 ford fairlane. I was wondering if i could use my horn on the siren output. The siren out put is a negative output with a pulse. How would i wire up the relay ? And i need to know if this ok to use on a 1amp ? The install manual says - ve siren output 1amp max.

Cheers rick

tedmond

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Joined: January 06, 2007

Location: Ontario, Canada

Posted: December 19, 2008 at 4:47 PM / IP Logged

horn is a ver low current since it uses a factory relay to control the horn. do you know if the Horn trigger on the car is negative or positive?

most cars are negative but there are positive so make sure. post back and i will show you what to do.

rikki_92

Member - Posts: 5

Joined: December 19, 2008

Location: Australia

Posted: December 19, 2008 at 5:41 PM / IP Logged

Mate i think it's a negative setup. Because the metal plate in my steering wheel is pressed the horn will sound.

tedmond

Gold - Posts: 4,610

Joined: January 06, 2007

Location: Ontario, Canada

Posted: December 19, 2008 at 5:48 PM / IP Logged

hey rikki,

i would like you to test the wire with a multi meter or a volt meter so i can verify then show you. I dont want to tell you something then it causes damage to the car.

test the wire like so

determines if you have a negative horn.

with volt meter, set it to DC @ 20volts

RED probe to constant 12volts

BLACK probe to horn wire on car.

the volt meter should show 0 volts. when you press the horn, it should jump from 0 to 11-12.4volts

determines if you have 12v horn style

with volt meter, set it to DC @ 20volts

RED probe to horn wire on car

BLACK probe to Ground

the volt meter should show 0 volts. when you press the horn, it should jump from 0 to 11-12.4volts

this indicates you have a positve horn.

testing will take about 2 mintues of your time. very simple task.

rikki_92

Member - Posts: 5

Joined: December 19, 2008

Location: Australia

Posted: December 19, 2008 at 6:54 PM / IP Logged

Mate from the relay to the horn it's positive. if you want me to i can scan my horn wiring. Hopefully i did this right.

Cheers rick

tedmond

Gold - Posts: 4,610

Joined: January 06, 2007

Location: Ontario, Canada

Posted: December 19, 2008 at 11:07 PM / IP Logged

if you can upload, sure that would be great.

rikki_92

Member - Posts: 5

Joined: December 19, 2008

Location: Australia

Posted: December 19, 2008 at 11:47 PM / IP Logged

This picture is from the factory ford manual.

And from what i can tell i don't think the alarm has a pulse single.

Thanks for your help mate

Cheers Rick

rikki_92

Member - Posts: 5

Joined: December 19, 2008

Location: Australia

Posted: December 19, 2008 at 11:49 PM / IP Logged

Here is the picture of the horn relay >br> siren output as horn -- posted image.

tedmond

Gold - Posts: 4,610

Joined: January 06, 2007

Location: Ontario, Canada

Posted: December 20, 2008 at 9:17 PM / IP Logged

your horn is a positive system, however you need a NEGATIVE trigger to trigger the factor relay.

just take the output you have now if negative and wire it to the horn wire on the car.

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siren output as horn

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