I should have searched first - here's a link.
http://www.rjh-heritage.ch/index_htm_files/Lucas%20Workshop%20Horns%209H.pdf
Alex Thomson
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Alex &
Janet Thomson
Sent: Wednesday, January 27, 2021 5:05 PM
To: 'Dave Connitt'; 'Paul Tegler'
Cc: triumphs@autox.team.net
Subject: Re: [TR] TR4A Horn Question
I thought that many electric horns had an adjustment screw on them to set the
operating current. Does that seem familiar to anyone?
Alex Thomson
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Dave
Connitt
Sent: Wednesday, January 27, 2021 4:46 PM
To: Paul Tegler
Cc: triumphs@autox.team.net
Subject: Re: [TR] TR4A Horn Question
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
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>
> --
> Paul Tegler
> ptegler@verizon.net www.teglerizer.com
>
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