Subject: Re: [TR] battery and charging system

From: DAVID MASSEY <[email-masked]>
Date: Fri, 8 Jul 2022 20:46:48 +0000 (UTC)

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 Your alternator is not charging.=C2=A0 Even a bad battery will respond to =
a charging current.=C2=A0 For example, if you have a shorted cell it will r=
ead around 10.5 volts with the engin off but will read closer to 12.5 when =
being charged.
=20
Dave=20

=20
=20
-----Original Message-----
From: dave northrup <[email-masked]>
To: TR3 Triumphs <[email-masked]>
Sent: Fri, Jul 8, 2022 1:49 pm
Subject: [TR] battery and charging system

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r the car is running or not, that means either the battery or the charging =
system is bad, right?  =C2=A0=20

 =C2=A0=20

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<div> <font size="3">Your alternator is not charging.&nbsp; Even a bad battery will respond to a charging current.&nbsp; For example, if you have a shorted cell it will read around 10.5 volts with the engin off but will read closer to 12.5 when being charged.</font><br>
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<div><font size="4">Dave <br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: dave northrup &lt;[email-masked]&gt;<br>
To: TR3 Triumphs &lt;[email-masked]&gt;<br>
Sent: Fri, Jul 8, 2022 1:49 pm<br>
Subject: [TR] battery and charging system<br>
<br>

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<div class="yiv5233273517MsoNormal">If the battery reads 11.33 v whether the car is running or not, that means either the battery or the charging system is bad, right?</div>

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From: <[email-masked]>
Date: Fri, 8 Jul 2022 15:33:34 -0600

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With the engine ON and running over 1200RPM, you should have ~ 13.8 to =
14.8 Volts Direct Current (VDC) reading on your meter across the battery =
terminals.

=20

With the engine OFF,  a good battery will read ~12.6 VDC

=20

Check and fill the electrolyte level of you have removeable caps, then =
put the battery on an overnight charge, get it to ~12.5 VDC, then try =
again.  Most alternators are not rated to charge a dead or dying battery =
and sometimes you will toast the regulator if it is trying to charge a =
low or dead battery.

=20

Could be the alternator itself or alternator regulator.

=20

Newer cars =E2=80=93 some =E2=80=93 will drop the charging if the =
battery load exceeds the rating of the alternator, others will just =
attempt to supply whatever the current load is until they burn out =
something.  My Jaguar tells me both if the battery is low on start or if =
the charging system is not working after starting, the miracle of =
technology.

=20

Cheers!

=20

Glenn aka StagByTriumph

=20

=20

If the battery reads 11.33 v whether the car is running or not, that =
means either the battery or the charging system is bad, right?

=20

=20

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class=3DWordSection1><p class=3DMsoNormal>With the engine ON and running =
over 1200RPM, you should have ~ 13.8 to 14.8 Volts Direct Current (VDC) =
reading on your meter across the battery terminals.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>With the =
engine OFF, =C2=A0a good battery will read ~12.6 VDC<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Check and =
fill the electrolyte level of you have removeable caps, then put the =
battery on an overnight charge, get it to ~12.5 VDC, then try =
again.=C2=A0 Most alternators are not rated to charge a dead or dying =
battery and sometimes you will toast the regulator if it is trying to =
charge a low or dead battery.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Could be the =
alternator itself or alternator regulator.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Newer cars =
=E2=80=93 some =E2=80=93 will drop the charging if the battery load =
exceeds the rating of the alternator, others will just attempt to supply =
whatever the current load is until they burn out something.=C2=A0 My =
Jaguar tells me both if the battery is low on start or if the charging =
system is not working after starting, the miracle of =
technology.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Cheers!<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Glenn aka =
StagByTriumph<o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><o:p>&nbsp;</o:p></b></p><p =
class=3DMsoNormal><b>Subject:</b> [TR] battery and charging =
system<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>If the =
battery reads 11.33 v whether the car is running or not, that means =
either the battery or the charging system is bad, =
right?<o:p></o:p></p><p =
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From: James Henningsen <[email-masked]>
Date: Fri, 8 Jul 2022 17:42:51 -0400

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In my opinion yes.  Check it with car not running after a good charge.  Chec=
k it with car running. Should increase over 13 when charging from alternator=
.  You are trying to determine if battery is bad or alternator.  I=E2=80=99d=
 put it on a trickle charge or regular charge and see if you get above 12 af=
ter the charge. If not it=E2=80=99s probably bad.   Auto parts store can hoo=
k up there machine to it and tell you too
Jim Henningsen=20

> On Jul 8, 2022, at 4:33 PM, dave northrup <[email-masked]> wrote:
>=20
> =EF=BB=BF
> If the battery reads 11.33 v whether the car is running or not, that means=
 either the battery or the charging system is bad, right?
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archi=
ve
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/trguy75=
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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"><div dir=3D"ltr"></div><div dir=3D"ltr">In m=
y opinion yes. &nbsp;Check it with car not running after a good charge. &nbs=
p;Check it with car running. Should increase over 13 when charging from alte=
rnator. &nbsp;You are trying to determine if battery is bad or alternator. &=
nbsp;I=E2=80=99d put it on a trickle charge or regular charge and see if you=
 get above 12 after the charge. If not it=E2=80=99s probably bad. &nbsp; Aut=
o parts store can hook up there machine to it and tell you too</div><div dir=
=3D"ltr">Jim Henningsen&nbsp;</div><div dir=3D"ltr"><br><blockquote type=3D"=
cite">On Jul 8, 2022, at 4:33 PM, dave northrup &lt;[email-masked]&gt; wro=
te:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=
=BB=BF

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<p class=3D"MsoNormal">If the battery reads 11.33 v whether the car is runni=
ng or not, that means either the battery or the charging system is bad, righ=
t?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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