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Car horn upgrade wiring problem

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D15NEL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D15NEL Quote  Post ReplyReply Direct Link To This Post Topic: Car horn upgrade wiring problem
    Posted: 07 Feb 2016 at 19:33
Be grateful if someone may be able to assist with this problem:

My son has a 2012 Toyota Aygo which he has today upgraded the standard horn to a Halfords Ring Automotive high power dual tone air horn. It looks very similar to the Stiebel Nautilus that get fitted to a lot of bikes.

The original horn is fed by a single wire and the installation instructions indicate that after the new horn is fitted the single wire is attached to the positive terminal of the new horn. A 25A rated wire then has to be made up and attached to the negative terminal of the new horn and then earthed to the car bodywork.

This we have done and the horn worked twice before blowing the existing 10A horn fuse.

The packaging of the new horn indicates that an inline 20A fuse may be needed although this is only shown to be needed when fitting to a new horn button switch.

There is also a relay in the packaging but this is specified for use on a 2 wire motorcycle system.

My son is going to take a run over to Halfords for advice tomorrow but I thought that the electrical experts on here may be able to highlight where we've gone wrong?

Thanks in advance for any advice

David
Retford, Notts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Normski Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 20:07
I think you need to use the relay, if it pulls enough current to blow a 10a fuse then if you try wiring it in without a relay and use a 20a fuse in place of the blowing 10a then you will quite likely burn the switch fairly soon.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew_C Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 20:24
+1 for that. Crap instructions.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 20:46
many vehicles do have a relay but it will need one look on line type in "How to wire a horn" the how to site is brilliant type How to and what you need to knoe like wire spotlights ect I even fund one how to redo the electric window on my VW Passat
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D15NEL Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 20:49
OK. Thanks for that.

To install the relay do we connect the original single horn wire to one of the 4 posts, then make up a separate feed in 25A cable with an inline 20A fuse to the battery positive terminal; add a third cable from the relay to ground and then just connect a single feed from the remaining relay post to the positive terminal of the new horn leaving the negative new horn connection empty?
David
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 20:52
Dave the How to website will not only have diagrams it usually has a guy showing you , I even found how to fit parts to a washing machine Good to see you on here buddy, My V11 went to a new owner last August I got a V11 EV Cali brilliant
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 22:09
Originally posted by D15NEL D15NEL wrote:

OK. Thanks for that.

To install the relay do we connect the original single horn wire to one of the 4 posts, then make up a separate feed in 25A cable with an inline 20A fuse to the battery positive terminal; add a third cable from the relay to ground and then just connect a single feed from the remaining relay post to the positive terminal of the new horn leaving the negative new horn connection empty?
You need to check the connections on the relay. Assuming it is a standard square 4 pin relay, it should have numbers next to the pins.
Wire to original horn goes to relay coil contact 86. Other coil connection 85 wired to vehicle earth. New wire via 20A fuse from battery positive to relay contact connection 30. Other relay contact connection 87 to new horn positive. New horn negative connected to vehicle earth.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2016 at 23:15
I concur...




Battery plus to 20A fuse.

20A fuse to relay 30.

Relay 87 to horn positive terminal.

Car's original horn output to relay 85.

Relay 86 to earth (e.g. horn negative terminal).

This should ensure you don't fry any of the car's original wiring or switches.

HTH

"Chicken nuggets don't dance on a Tuesday."
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D15NEL Quote  Post ReplyReply Direct Link To This Post Posted: 08 Feb 2016 at 02:57
Thanks to everyone for their help. Will get this sorted this week.
David
Retford, Notts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 08 Feb 2016 at 08:50
Is the relay you have a 5 pin or 4 pin?
If 4 pin, no problem, but if 5 pin you must connect to 87 not 87a. It would be a bit noisy if you connect to 87a as the horn would be on all the time except when you press the horn button. LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scousus maximus Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2016 at 15:59
That would be useful for the Italians then. Wink

Regards,
John
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Post Options Post Options   Thanks (0) Thanks(0)   Quote D15NEL Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2016 at 05:54
I used the input on this thread to help me upgrade the single horn on my Thruxton to a twin set up:




The horns are from Halfords and are a good improvement over the stock item which was originally mounted centrally below the headstock. You can see the original mounting bolt in this pic:


So under the seat I have a fused relay and I was wondering if there is any way to use the same relay to feed a supply for heated gloves? This would avoid the need to add further ring connectors to the battery terminals which already have the relay feeds plus a charge lead connected. I think I've seen somewhere on the net that a terminal block can be piggy backed from the battery in some way to enable accessories to be fitted in a tidy manner and allow them to be operated only when the bike is live to avoid draining the battery?

Any experience anyone? I would rather not cut into an existing live wiring so that the bike can always be returned to standard if necessary.

Many thanks
David
David
Retford, Notts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 12 Nov 2016 at 10:12
Well unless you have wired up the relay in a different way to what I would expect, you would only get warm hands when you sound the horn. Could get a bit noisy on a cold day.Wink
Brian.

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