Subject: [TR] TR4A Horn Question

From: Dave Connitt <[email-masked]>
Date: Wed, 27 Jan 2021 15:50:04 -0500

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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Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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From: Dave Connitt <[email-masked]>
Date: Wed, 27 Jan 2021 17:20:33 -0500

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Yes, I have a good ground,=20
Thanks,
Dave Connitt=20

Sent from my iPhone

> On Jan 27, 2021, at 4:44 PM, David Friedlander <[email-masked]> wrote:=

>=20
> =EF=BB=BF
> Dave;
>=20
> I assume you've checked the ground wires for each horn....
>=20
> Dave
>=20
>> On Wed, Jan 27, 2021 at 3:50 PM Dave Connitt <[email-masked]> wrote:
>> Hi All,
>> One of my winter projects is to determine why the horn fuse in my TR4A ke=
eps blowing.=20
>> I had installed a Advanced AutoWire harness during the restoration. The h=
arness contains a 20 amp fuse for the horn. The horns are new as of the rest=
oration. I went through the wiring harness and could not find a issue there s=
o now I am looking at the horns themselves and that is where I need your hel=
p. I measured the horn coil resistance and it is 0.8 ohms in both of them. I=
f I use 13.8 VDC as my battery voltage, I get 17.25 amps at the fuse which i=
s too close to the 20 amp fuse rating in my opinion. If the resistance was e=
ven 0.9 ohms, the fuse current would be a little over 15 amps which would ma=
ke more sense. Does anyone know what I should see as a horn coil resistance o=
n a good horn?
>> Dave Connitt=20
>>=20
>>=20
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/arch=
ive
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/forzio=
[email-masked]

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Yes, I have a good ground,&nbsp;<div>Thanks=
,</div><div>Dave Connitt&nbsp;<br><br><div dir=3D"ltr">Sent from my iPhone</=
div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Jan 27, 2021, at 4:44 P=
M, David Friedlander &lt;[email-masked]&gt; wrote:<br><br></blockquote><=
/div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr"><d=
iv class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fon=
t-size:large;color:#000099">Dave;</div><div class=3D"gmail_default" style=3D=
"font-family:comic sans ms,sans-serif;font-size:large;color:#000099"><br></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f;font-size:large;color:#000099">I assume you've checked the ground wires fo=
r each horn....</div><div class=3D"gmail_default" style=3D"font-family:comic=
 sans ms,sans-serif;font-size:large;color:#000099"><br></div><div class=3D"g=
mail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:large;=
color:#000099">Dave</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Wed, Jan 27, 2021 at 3:50 PM Dave Connitt &lt;<a h=
ref=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">Hi All,<br>
One of my winter projects is to determine why the horn fuse in my TR4A keeps=
 blowing. <br>
I had installed a Advanced AutoWire harness during the restoration. The harn=
ess contains a 20 amp fuse for the horn. The horns are new as of the restora=
tion. I went through the wiring harness and could not find a issue there so n=
ow 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 u=
se 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 mo=
re sense. Does anyone know what I should see as a horn coil resistance on a g=
ood horn?<br>
Thanks in advance,<br>
Dave Connitt <br>
<br>
Sent from my iPhone<br>
** <a href=3D"mailto:[email-masked]" target=3D"_blank">triumphs@aut=
ox.team.net</a> **<br>
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t=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/triumphs" rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/triumphs</a>&nbsp; <a hre=
f=3D"http://www.team.net/archive" rel=3D"noreferrer" target=3D"_blank">http:=
//www.team.net/archive</a><br>
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s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.team=
.net/mailman/options/triumphs/[email-masked]</a><br>
</blockquote></div>
</div></blockquote></div></body></html>=

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