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I counted, I only have two(2) fuses on my =E2=80=9858 TR3. Where might the=
other be?
Thx,
Bill B
TS30800L
Serenity Now......
On Jun 24, 2020, at 9:38 AM, DAVID MASSEY <dave1massey@cs.com> wrote:
=EF=BB=BF
Keep in mind that these wire harnesses, like the car as a whole, was designe=
d to a budget. These harnesses had three (count 'em, 3) fuses. As such som=
e items were unfused like the headlamps and the coil. And those things that=
are fused shared a fuse so the fuse had to be sized to carry the current fo=
r everything on that circuit. But the wires were sized for the particular l=
oad. A thinner wire will have a nigher resistance and under short-circuit c=
onditions the current can be limited to a level that will not blow the fuse b=
ut the current will cause enough heating to cause the insulation to melt.
Another factor against us is the age of the harness. The connector contacts=
get corroded and will get hot under normal circumstances. Wire strands can=
fatigue and break within the insulation again resulting in overheating unde=
r normal use. The insulation gets stiff and cracks exposing the wires withi=
n. Lots of potential failure modes here. =20
Compare this design to those found in modern cars you will see dozens of fus=
es. Sure there are a lot more electrical items but most things have their o=
wn fuses. This means you can size the fuse more appropriately for the wire u=
sed to power that device. Also the connectors used are water tight and don'=
t corrode as quickly. Also, they are, on the whole, a lot younger and there=
fore retain more of their original integrety.
But a fresh works well enough so if you fear a melt-down a new harness may b=
e a good investment.
Dave=20
-----Original Message-----
From: bill beecher <notakitcar@yahoo.com>
To: Tom Householder <trhouse@columbus.rr.com>
Cc: Triumphs@Autox.team.net daily digest <triumphs@autox.team.net>; FOT List=
<fot@autox.team.net>
Sent: Tue, Jun 23, 2020 8:52 am
Subject: Re: [TR] TR2-3 electrical melt downs
Have a friend with a TR6 that had a significant meltdown behind the dash. I=
should think, given the right set of weaknesses, most any section could mel=
t.=20
Bill B
Serenity Now......
On Jun 23, 2020, at 4:52 AM, Tom Householder <trhouse@columbus.rr.com> wrote=
:
=EF=BB=BFOver the years I have experienced and seen harness melt down in the=
looms to the tail lights .. anyone ever had an under dash melt down?
Trying to answer a question asked of me.=20
Tom=20
** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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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">I counted, I only have two(2) fuses on my =E2=
=80=9858 TR3. Where might the other be?<div>Thx,</div><div>Bill B</di=
v><div>TS30800L<br><br><div dir=3D"ltr">Serenity Now......</div><div dir=3D"=
ltr"><br>On Jun 24, 2020, at 9:38 AM, DAVID MASSEY <dave1massey@cs.com>=
; wrote:<br><br></div><div dir=3D"ltr">=EF=BB=BF
<div style=3D"color:black;font: 12pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"3">Keep in mind that these wire harnesses, like the car a=
s a whole, was designed to a budget. These harnesses had three (count '=
em, 3) fuses. As such some items were unfused like the headlamps and t=
he coil. And those things that are fused shared a fuse so the fuse had=
to be sized to carry the current for everything on that circuit. But t=
he wires were sized for the particular load. A thinner wire will have a=
nigher resistance and under short-circuit conditions the current can b=
e limited to a level that will not blow the fuse but the current will cause e=
nough heating to cause the insulation to melt.</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">Another factor against us is the age of the harness.&n=
bsp; The connector contacts get corroded and will get hot under normal circu=
mstances. Wire strands can fatigue and break within the insulation aga=
in resulting in overheating under normal use. The insulation gets stif=
f and cracks exposing the wires within. Lots of potential failure mode=
s here. <br>
</font></div>
<div><font size=3D"3"><br>
</font></div>
<div><font size=3D"3">Compare this design to those found in modern cars you w=
ill see dozens of fuses. Sure there are a lot more electrical items bu=
t most things have their own fuses. This means you can size the fuse m=
ore appropriately for the wire used to power that device. Also the con=
nectors used are water tight and don't corrode as quickly. Also, they a=
re, on the whole, a lot younger and therefore retain more of their original i=
ntegrety.</font></div>
<div><br>
</div>
<div><font size=3D"3">But a fresh works well enough so if you fear a melt-do=
wn a new harness may be a good investment.</font><br>
</div>
<div> <br>
</div>
<div style=3D"clear:both"><font size=3D"4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----O=
riginal Message-----<br>
From: bill beecher <notakitcar@yahoo.com><br>
To: Tom Householder <trhouse@columbus.rr.com><br>
Cc: Triumphs@Autox.team.net daily digest <triumphs@autox.team.net>; FO=
T List <fot@autox.team.net><br>
Sent: Tue, Jun 23, 2020 8:52 am<br>
Subject: Re: [TR] TR2-3 electrical melt downs<br>
<br>
<div dir=3D"ltr">Have a friend with a TR6 that had a significant meltdown be=
hind the dash. I should think, given the right set of weaknesses, most=
any section could melt. <br clear=3D"none">Bill B<br clear=3D"none"><br cle=
ar=3D"none">Serenity Now......<br clear=3D"none"><br clear=3D"none">On Jun 2=
3, 2020, at 4:52 AM, Tom Householder <<a shape=3D"rect" ymailto=3D"mailto=
:trhouse@columbus.rr.com" href=3D"mailto:trhouse@columbus.rr.com";>trhouse@co=
lumbus.rr.com</a>> wrote:<br clear=3D"none"><br clear=3D"none">=EF=BB=BFO=
ver the years I have experienced and seen harness melt down in the looms to t=
he tail lights .. anyone ever had an under dash melt down?<br clear=3D"none"=
><br clear=3D"none">Trying to answer a question asked of me. <br clear=3D"no=
ne"><br clear=3D"none">Tom <br clear=3D"none">** <a shape=3D"rect" ymailto=3D=
"mailto:triumphs@autox.team.net"; href=3D"mailto:triumphs@autox.team.net";>tri=
umphs@autox.team.net</a> **<br clear=3D"none"><br clear=3D"none">Donate: <a s=
hape=3D"rect" href=3D"http://www.team.net/donate.html"; target=3D"_blank">htt=
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" href=3D"http://www.team.net/pipermail/triumphs"; target=3D"_blank">http://w=
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