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It really doesn't make a lot of difference which one is disconnected,
either will prevent any danger of a short. But there is a good reason to
do the negative, or at least do it first. The reason is that if your
wrench accidentally hits a part of the body or frame while removing the
negative terminal, it is not a problem because they are normally connected
to the negative terminal anyway. But, if your wrench slips while undoing
the positive terminal and hits the body or frame, you are arc welding.
Once the negative is disconnected, there is no path for current back to the
battery, so the risk is eliminated.
On Wed, Jan 13, 2016 at 11:44 AM, MICHAEL ROWE via Spridgets <
spridgets@autox.team.net> wrote:
> Instructions for working on the gauges of my Toyota say remove the
> negative battery terminal. This makes no sense to me. It leaves all the
> hot wires live, so if your tool grounds one of them, it will spark.
> Removing the positive terminal eliminates this possibility.
>
> Some years ago, I put in a kill switch on the ground terminal, and the car
> would continue to run when the ground was open. It only prevented
> starting. In fact, this is one of the electrical tests mentioned by John
> Twist.
>
> All of my cars have a disconnect knob on the positive terminal. Do I have
> this backward?
> Michael Rowe
>
> ------------------------
>
> spridgets@autox.team.net
>
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--
=================================
= Never offend people with style when you =
= can offend with substance --- Sam Brown =
=================================
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<div dir=3D"ltr">It really doesn't make a lot of difference which one i=
s disconnected, either will prevent any danger of a short.=C2=A0 But there =
is a good reason to do the negative, or at least do it first.=C2=A0 The rea=
son is that if your wrench accidentally hits a part of the body or frame wh=
ile removing the negative terminal, it is not a problem because they are no=
rmally connected to the negative terminal anyway.=C2=A0 But, if your wrench=
slips while undoing the positive terminal and hits the body or frame, you =
are arc welding.=C2=A0 Once the negative is disconnected, there is no path =
for current back to the battery, so the risk is eliminated. <br></div><div =
class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Jan 13, 2016 a=
t 11:44 AM, MICHAEL ROWE via Spridgets <span dir=3D"ltr"><<a href=3D"mai=
lto:spridgets@autox.team.net" target=3D"_blank">spridgets@autox.team.net</a=
>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Instructions for work=
ing on the gauges of my Toyota say remove the negative battery terminal.=C2=
=A0 This makes no sense to me.=C2=A0 It leaves all the hot wires live, so i=
f your tool grounds one of them, it will spark.=C2=A0 Removing the positive=
terminal eliminates this possibility.<div><br></div><div>Some years ago, I=
put in a kill switch on the ground terminal, and the car would continue to=
run when the ground was open.=C2=A0 It only prevented starting.=C2=A0 In f=
act, this is one of the electrical tests mentioned by John Twist. =C2=A0</d=
iv><div><br></div><div>All of my cars have a disconnect knob on the positiv=
e terminal.=C2=A0 Do I have this backward?</div><span class=3D"HOEnZb"><fon=
t color=3D"#888888"><div>Michael Rowe</div>
</font></span><br>------------------------<br>
<br>
<a href=3D"mailto:spridgets@autox.team.net";>spridgets@autox.team.net</a><br=
>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=
=3D"_blank">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums"; rel=3D"noreferrer" target=3D=
"_blank">http://www.team.net/forums</a><br>
ets/jdinnis@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox.te=
am.net/mailman/options/spridgets/jdinnis@gmail.com</a><br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>=3D Never offend people with style =
when you=C2=A0=C2=A0 =3D<br>=3D can offend with substance --- Sam Brown=C2=
=A0 =3D<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div>
</div>
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spridgets@autox.team.net
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