Hi Jerry,
The horn button controls a specific â??hornâ?? relay in this harness but itâ??s
recommended current limit is 15 amps. The horns I have pull 17.25 amps. The
horns I have are new and I bet the original ones needed less current. I am
going to call Scott Harper tomorrow and see if he has some old ones.
I thought about increasing the wire size of the horn circuit.
Dave Connitt
Sent from my iPhone
> On Jan 27, 2021, at 5:12 PM, Jerry Van Vlack <jerryvv@roadrunner.com> wrote:
>
> Dave are you going thru a relay? If yes then which fuse is blowing? You
> could always increase the wire sizing from the relay to the horn and fuse it
> accordingly. But why am I even giving advice to an EE?
> JVV
>
> -----Original Message----- From: 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
>>> ** triumphs@autox.team.net **
>>>
>>> Donate: http://www.team.net/donate.html
>>> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
>>>
>>> Unsubscribe/Manage:
>>> http://autox.team.net/mailman/options/triumphs/ptegler@verizon.net
>>
>> --
>> Paul Tegler
>> ptegler@verizon.net www.teglerizer.com
>>
>> ** triumphs@autox.team.net **
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/triumphs/dconnitt@fuse.net
>
> ** triumphs@autox.team.net **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/jerryvv@roadrunner.com
** triumphs@autox.team.net **
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
Unsubscribe/Manage:
http://autox.team.net/mailman/options/triumphs/mharc@autox.team.net
|