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Aftermarket horn issues.

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Old 12-31-2014, 09:46 AM
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Default Aftermarket horn issues.

Hey guys... I have a wolo 320-2T high/lone tone horn on my civic... I wired it through a relay but I'm having issues... I'm aware the horn has it's own relay and to that I have my alarm horn honk connect on the horn trigger.

But the aftermarket is hook up this way on a separate RELAY.. 30 to battery with 15 amp fuse. 86 to horn wire. 85 grounded to chassis and 87 to horn.

Horn has 2 terminals any side can be use as pos or neg. Horn is grounded with brace to chassis and termnal connection.. other horn terminal to 87 on relay.

My issue is with car off horn honk loud and clean even with alarm... but with ignition on and running it's low and distorted...

Is this a grounding issue or relay issue?
Old 12-31-2014, 09:55 AM
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Default Re: Aftermarket horn issues.

Originally Posted by chillerice
30 to battery with 15 amp fuse. 86 to horn wire. 85 grounded to chassis and 87 to horn.

Horn has 2 terminals any side can be use as pos or neg. Horn is grounded with brace to chassis and termnal connection.. other horn terminal to 87 on relay.
I don't know what the numbers^ mean.

Post pictures of your wiring job or post a circuit diagram.

You also need to mention what car you have.
Old 12-31-2014, 10:22 AM
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Default Re: Aftermarket horn issues.

The pinouts on the relay.
Old 12-31-2014, 10:57 AM
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Default Re: Aftermarket horn issues.

Originally Posted by RonJ@HT
I don't know what the numbers^ mean.

Post pictures of your wiring job or post a circuit diagram.

You also need to mention what car you have.

Here's a sketch Ron. The car is in my thumbnail. 98 civic
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Old 12-31-2014, 11:01 AM
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Default Re: Aftermarket horn issues.

That helps.

What car? Are you using the original horn relay?
Old 12-31-2014, 11:12 AM
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Default Re: Aftermarket horn issues.

Originally Posted by RonJ@HT
That helps.

What car? Are you using the original horn relay?
1998 civic ex. The original relay that is under the dash next to the fuse box is still there. The relay mounted near the horn is a SPDT 30 amp relay I got from autozone.
Old 12-31-2014, 12:24 PM
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Default Re: Aftermarket horn issues.

Originally Posted by grumblemarc
The pinouts on the relay.
Do I need the second relay (not the horn one in the dash) to honk the horn and be safe?

These aftermarket horn draw 15 amps....
Old 12-31-2014, 12:28 PM
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Default Re: Aftermarket horn issues.

Below is the horn circuit for the stock 98 Civic. I see no need for the aftermarket relay. Just attach the Blu/Red horn wire to the aftermarket horn (+) terminal and leave aftermarket horn ground wire attached to the chassis as shown in your hand-drawn diagram. Installation should be that simple.


Old 12-31-2014, 04:23 PM
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Default Re: Aftermarket horn issues.

Originally Posted by RonJ@HT
Below is the horn circuit for the stock 98 Civic. I see no need for the aftermarket relay. Just attach the Blu/Red horn wire to the aftermarket horn (+) terminal and leave aftermarket horn ground wire attached to the chassis as shown in your hand-drawn diagram. Installation should be that simple.


Won't the amp draw from the horn blow the fuse and also make me lose my brake light or it lighting up with horn pressed? I just wanna be on the safe side.
Old 12-31-2014, 04:40 PM
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Default Re: Aftermarket horn issues.

Try it. It's just a fuse.
Old 12-31-2014, 04:42 PM
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Default Re: Aftermarket horn issues.

Originally Posted by grumblemarc
Try it. It's just a fuse.
Ok thank you
Old 12-31-2014, 04:54 PM
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Default Re: Aftermarket horn issues.

Your stock 15A fuse should be fine. Wolo's tech specs only call for a 15A fuse on the horn.
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