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Horn problems and battery fuse blowing... by shaneg
Started on: 03-02-2015 05:15 PM
Replies: 5 (171 views)
Last post by: Gall757 on 03-03-2015 02:27 PM
shaneg
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From: Springfield MO
Registered: Jun 2013


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Report this Post03-02-2015 05:15 PM Click Here to See the Profile for shanegClick Here to Email shanegSend a Private Message to shanegEdit/Delete MessageReply w/QuoteDirect Link to This Post
Today my 86 Fiero started to honk the horn randomly. Eventually, the horn stayed on. I wiggled parts on the fuse board around and it stopped.
Next I noticed a vibrating from a relay underneath the passenger dash. It wouldn't make the noise when the doors were open and my radio was going on and off. I looked at it and the bottom was busted out. I took it to O'Reilly's and they said it was the horn relay. Okay, that explains the horn, I thought. I switched it out and noticed my battery fuse had blown. This explains the radio. I then switched it for another fuse and it blew immediately.
Then I tried again and it was fine... until I turned the car on. I got a buzzing noise from the relay I had replaced until the battery fuse blew again and the buzzing stopped.

Any ideas as to what is happening?
Did they give me the wrong relay? Is my fuse the wrong size? (25A is what was in there).
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shaneg
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From: Springfield MO
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Report this Post03-02-2015 07:14 PM Click Here to See the Profile for shanegClick Here to Email shanegSend a Private Message to shanegEdit/Delete MessageReply w/QuoteDirect Link to This Post
Update,
I detached the horn and the problem persisted. I decided to just detach the horn relay and the problem is gone.
I would still appreciate some feedback if anyone knows what is happening.
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Gall757
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Report this Post03-02-2015 09:18 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
It's supposed to be a 20 amp fuse.

New parts are not necessarily good parts.
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thx569
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Report this Post03-03-2015 06:40 AM Click Here to See the Profile for thx569Click Here to Email thx569Send a Private Message to thx569Edit/Delete MessageReply w/QuoteDirect Link to This Post
Years ago my shop was looking for reason why the horn would blow the fuse on a chev pickup truck. We finally traced it to a splice under the dash in the harness that connected the horn fuse and lighter fuse to power up the lighter and horn. The engineers made the wires undersized. It turned out the cigarette lighter has semi melted and was shorting out the plug somewhat causing a drain. Disconnect your lighter and try the horn again. This sounds sooooo familiar.

P
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sardonyx247
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Report this Post03-03-2015 06:55 AM Click Here to See the Profile for sardonyx247Click Here to visit sardonyx247's HomePageClick Here to Email sardonyx247Send a Private Message to sardonyx247Edit/Delete MessageReply w/QuoteDirect Link to This Post
Yeah the radio and cig lighter fuse are the same circut, (hold down the cig lighter, the fuse blows, the radio quits and usally the brake light will come on, as then it is back feeding a circut) just an fyi
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Gall757
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Report this Post03-03-2015 02:27 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Batt fuse circuit. It's only part of the radio power, but all of the cigar lighter and horn relay.

[This message has been edited by Gall757 (edited 03-03-2015).]

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