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Re: [TR] TR4A Horn Question

To: Paul Tegler <ptegler@verizon.net>
Subject: Re: [TR] TR4A Horn Question
From: Dave Connitt <dconnitt@fuse.net>
Date: Wed, 27 Jan 2021 16:46:11 -0500
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References: <41088454-62ac-cce0-0b5f-5467f2b4c7ff@verizon.net>
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I read through my Advanced AutoWire manual just now and it specifies a horn 
circuit max. current of 15 amps so I will need to find some horns that have a 
coil resistance of about 1 ohm if I donâ??t change anything else. I know the 
relay is rated at 30 amps. 
Sigh..
Dave Connitt 

Sent from my iPhone

> On Jan 27, 2021, at 4:35 PM, Paul Tegler <ptegler@verizon.net> wrote:
> 
> ...not sure of the coil spec...but just for a reference....
> a normal buss style fuse marked 'rating' is the spec holding current. (should 
> not blow) It can take 10+ minutes to blow at 25% over the spec
> The 'voltage' rating is the guaranteed 'disconnect blocking' voltage after 
> the fuse blows.
> 
> So your horns must be spiking higher than the fuse rating to blow it quickly
> 
> ptegler
> 
> 
>> On 1/27/2021 3:50 PM, Dave Connitt wrote:
>> Hi All,
>> One of my winter projects is to determine why the horn fuse in my TR4A keeps 
>> blowing.
>> I had installed a Advanced AutoWire harness during the restoration. The 
>> harness contains a 20 amp fuse for the horn. The horns are new as of the 
>> restoration. I went through the wiring harness and could not find a issue 
>> there so now I am looking at the horns themselves and that is where I need 
>> your help. I measured the horn coil resistance and it is 0.8 ohms in both of 
>> them. If I use 13.8 VDC as my battery voltage, I get 17.25 amps at the fuse 
>> which is too close to the 20 amp fuse rating in my opinion. If the 
>> resistance was even 0.9 ohms, the fuse current would be a little over 15 
>> amps which would make more sense. Does anyone know what I should see as a 
>> horn coil resistance on a good horn?
>> Thanks in advance,
>> Dave Connitt
>> 
>> Sent from my iPhone
>> ** triumphs@autox.team.net **
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> 
> -- 
> Paul Tegler
> ptegler@verizon.net  www.teglerizer.com
> 
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