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Installing aftermarket horns, which wiring is correct?

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Old 07-12-11, 12:58 PM
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Installing aftermarket horns, which wiring is correct?

I am thinking number 2 but want to double check.



OR



Thanks,
Old 07-12-11, 01:31 PM
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Since a depressed horn button causes a ground to be sent out on the G/O wire, the second diagram should be the correct method.
Old 07-12-11, 01:45 PM
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that's what i thought. didnt want to melt anything. thanks
Old 07-12-11, 03:39 PM
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No No No... you got it all wrong!!! You need to hook your horn wire up to 87a!

Old 07-12-11, 08:41 PM
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ok, i need some help with this. i have everything wired like picture #2 and i am not getting a ground signal from the horn button. when i hook up the OEM horns, they works fine. when i hook up the new horns and relay, i just hear the cpu click on the inside of the car when the horn button is pressed. when i ground pin 85 on the new relay, the new horns work.

any ideas?

i am using a removeable relay harness plug thing, could one of the contacts be bad?
Old 07-12-11, 09:03 PM
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When the horn button is depressed what is the voltage on the G/O wire as it should be 0 volts.
Old 07-12-11, 09:11 PM
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both signal wires have no voltage on them when the horn is not pressed in.
Old 07-12-11, 09:35 PM
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so i get 12v on the signal wire when the horn is pushed. i hooked it up like #1 and it works fine
Old 07-12-11, 09:45 PM
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G/W is supposed to be constant voltage while the horn button is connected to a ground and that would be the Green/Orange wire. I gather you have different wire colrs or something but if it works!
Old 07-12-11, 09:46 PM
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i thought it was green/red but it could also be green/orange. it has 12v only when the horn button is pressed in
Old 07-12-11, 09:54 PM
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I must have misunderstood what you were doing for I thought you were replacing the CPU relay with a newer relay. Oh well.
Old 07-12-11, 09:55 PM
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i'm installing hella supertones. they are LOUD
Old 07-13-11, 12:57 AM
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Is 85 a power or ground? I thought 85 and 86 could be hooked up either way....as long as they were different.
Old 07-13-11, 07:00 AM
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Originally Posted by PvillKnight7
Is 85 a power or ground? I thought 85 and 86 could be hooked up either way....as long as they were different.
they can be. one is ground, the other is the oem signal wire
Old 07-14-11, 10:53 PM
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Originally Posted by 87 t-66
i'm installing hella supertones. they are LOUD
I want some of those!
send pics Adam!
Old 07-14-11, 11:09 PM
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ive got them mounted between my radiator and FMIC. i have everything put back together and my cooling panel that goes above them already screwed back down. i'm too lazy to remove the panel again right now. the horns look like this and are a lot louder than stock:

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